I am running a fully updated LTS copy of Ubuntu server. Today I ran rkhunter (as I do from time to time). This is the output I got:

 Warning: The file properties have changed:
[15:52:25]          File: /bin/ps
[15:52:25]          Current hash: f22991ec93ae966c856d367f42fc3d8a484bd827
[15:52:25]          Stored hash : 1892268bf195ac118076b1b0f53e7a637eb6fbb3
[15:52:25]          Current inode: 142902    Stored inode: 130894
[15:52:25]          Current file modification time: 1324307913 (19-Dec-2011 07:18:33)
[15:52:25]          Stored file modification time : 1260992081 (16-Dec-2009 11:34:41)



 Warning: The file properties have changed:
[15:52:33]          File: /usr/bin/ldd
[15:52:33]          Current hash: f1e2ca5aa3a28994e2cebb64c993a72b7d97b28c
[15:52:33]          Stored hash : 295d9cedb121a5e431a39a6d201ecd7ce5640497
[15:52:33]          Current inode: 2236210    Stored inode: 2234359
[15:52:33]          Current size: 5280    Stored size: 5279
[15:52:33]          Current file modification time: 1331165514 (07-Mar-2012 16:11:54)
[15:52:33]          Stored file modification time : 1295653965 (21-Jan-2011 15:52:45)



 Warning: The file properties have changed:
[15:52:37]          File: /usr/bin/pgrep
[15:52:37]          Current hash: 3eada9a96760f3e2c9111cfe32901d1432813c1d
[15:52:37]          Stored hash : ce265d0db9964b173fe5036f703a9b8d66e55df3
[15:52:37]          Current inode: 2229646    Stored inode: 2224867
[15:52:37]          Current file modification time: 1324307913 (19-Dec-2011 07:18:33)
[15:52:37]          Stored file modification time : 1260992081 (16-Dec-2009 11:34:41)




Warning: The file properties have changed:
[15:52:41]          File: /usr/bin/top
[15:52:41]          Current hash: 6be13737d8b0950cea2f1ae3a46d4af713dbe971
[15:52:41]          Stored hash : c7b495ecef3982eeb6f08a511861b1a1ae8775e6
[15:52:41]          Current inode: 2229629    Stored inode: 2224862
[15:52:41]          Current file modification time: 1324307913 (19-Dec-2011 07:18:33)
[15:52:41]          Stored file modification time : 1260992081 (16-Dec-2009 11:34:41)



Warning: The file properties have changed:
[15:52:53]          File: /usr/sbin/cron
[15:52:53]          Current hash: e783ca973f970aa8a4bf5edc670e690b33914c3d
[15:52:53]          Stored hash : 4718257a8060736b9058aed025c992f02a74a5a7
[15:52:53]          Current inode: 2224719    Stored inode: 2228839
[15:52:54]          Current file modification time: 1330965568 (05-Mar-2012 08:39:28)

There were also a few other I left out. Has my server been rooted? I am running fail2ban and do monitor failed ssh logins. nothing has come up. Could someone compare these hashes to their copy of Ubuntu Server (lts)? Please tell me these are false positives.....

Edit: is something else like rkhunter I can run for a second scan?