Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf21d07edc4d284c…

MALICIOUS

PDF

55.1 KB Authoring application: Soda PDF
MD5: fb2944eff05b1d4fb2e601a185257fe4 SHA-1: 0d658242e759536113a54a7d20fe3712aa9ea16a SHA-256: cf21d07edc4d284c37902769950cea0439703d1562d1132d389d80690f34ca78
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, with the primary domain being cmillns.com. The document body contains obfuscated text and a list of URLs, suggesting a link farm designed to redirect users to potentially malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cmillns.com/uploads/1/3/0/7/130738889/9242903.pdf
    • http://casemedicine.org/uploads/1/3/0/5/130589433/gesozupal.pdf
    • http://rucomingout.com/uploads/1/3/0/4/130476372/2690652.pdf
    • http://juliablack.net/uploads/1/3/0/5/130588700/6203497.pdf
    • https://nolupunitis.weebly.com/uploads/1/3/0/5/130550859/374679be.pdf
    • http://amazingcreationstaxidermy.com/uploads/1/3/0/5/130551491/1975670.pdf
    • http://guji.antizavtra.ru/uploads/2020/01/28/lovokogulu-gumukemofavid-jifava.pdf
    • http://cityonloc.com/uploads/1/3/0/5/130551103/130551103.html#movies+2015+bollywood

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001162.bin
48bf56353679ce3699e18d2f74614a4fb42acb69865c49cb435338372aec5045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1162 8896 bytes
font_01_sfnt_off000092be.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92BE 16036 bytes

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