This is a great below video of a black UFO going across the moon. I see that the person in the video zoomed it, but I believe this caused distortion to the photo and lost its original shape. Also as the object shoot across the moon it changes shape, which is probably due to the earths atmosphere vs the speed of the object. I have found many UFOs long ago on the moon's surface that were flat black in color...like this one and 6 sided.

Also a few years ago an Italian astronomer recorded a UFO by accident while trying to clean his telescope and focus his optics. I mention him because his video shows a round UFO moving very low and close to the surface of the moon and changing course in great detail. I will post his video below.

Date of sighting: November 15, 2013
Location of sighting: Earths Moon
Cam Link: http://www.ustream.tv/channel/tree0fmight

Reference: UFOSightingsDaily.com