I was gonna say you're nuts, but it seems there's a some kind of pattern, so sorry about that :D. These are the filenames for three different Calvin & Hobbes cartoons from Feb 8 to Feb 10. 24 hex similarity, so... you need to reverse 32 bits?

145afe502d7601393f0c005056a9545d.jpg

126fdbc02d7601393f0c005056a9545d.jpg

163e6fa02d7601393f0c005056a9545d.jpg

It could be some kind of combined hash for date + comic + service.