How to Find the SHA 1 Hash of a blocked file in Content Analysis
To view the hash of the files that have been blocked by the Content Analysis, look at the Recent Threats section in Statistics in the WebGUI and view the report of the file to get the hash. To navigate there from the WebGUI, go to Statistics > Recent Threats. From there, select the file you want and click view report.
The SHA 1 Hash is in the report: