Yesterday I wrote about a click bombing incident that this site suffered through. Although I found the culprits by analyzing my web logs, I later realized that I could have used Google Analytics also.
The report shown here is just the normal Behavior -> Adsense -> Adsense Pages report with the secondary dimension Users -> Network Domain added. That plainly shows the domain(s) responsible for Adsense activity.
However, it's also possible for click-bombing to be indirect: someone posts your URL somewhere and encourages others to attack you. That sort of activity MIGHT be able to be spotted with the Acquisition -> Overview -> Referrals report with Adsense added to it:
In this case, there was none of that activity and the report plainly shows it.