Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c39855f12f5ed50…

MALICIOUS

PDF

44.5 KB Authoring application: Soda PDF
MD5: d622d1431760827d09aa6795d61401ce SHA-1: f9bc5cf18c86e34afa5bc8c9121dcc4735106b1f SHA-256: 7c39855f12f5ed500f7ef13ced65d5f2fa5c1e44c7ffc159e7cf97b64b212430
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also indicate maliciousness. The embedded URLs suggest a phishing or SEO spam campaign, aiming to direct users to a network of seemingly unrelated PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://minnesotahistorymuseums.org/uploads/1/3/0/5/130590457/3673742.pdf
    • http://mj2startups.com/uploads/1/3/0/4/130483616/natenado.pdf
    • http://fertilizer-active.com/uploads/2020/01/28/9680928.pdf
    • http://newfilmmakersadventure.com/uploads/1/3/0/6/130620841/5680651.pdf
    • http://integratedvalue.org/uploads/1/3/0/7/130775033/disawezijofuvit.pdf
    • http://bakedbounties.com/uploads/1/3/0/5/130538946/lukuxibevugafa_joxedu_bopewovar.pdf
    • http://papiramirez.com/uploads/1/3/0/6/130639266/xageve.pdf
    • http://downingcpa.com/uploads/1/3/0/7/130738969/1956638.pdf
    • http://cecilyeiferle.com/uploads/1/3/0/6/130621613/130621613.html#esl+speaking+placement+test

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001180.bin
0a59e5e857e552faac6085e001d1e1ba63ec53f05b2fbd36e36f90666a3326a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1180 7932 bytes
font_01_sfnt_off00006733.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6733 16204 bytes

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