Malicious PDF — malware analysis report

Static analysis result for SHA-256 f526066597b95539…

MALICIOUS

PDF

35.3 KB Authoring application: Adobe PDF Library 9.0
MD5: 13a8080c76026404b926692c2507ddaf SHA-1: 98f73f39ab6ef869f1d2e68d7dce328cdd1199fb SHA-256: f526066597b95539b7cee4ba34b8c47fabdb1043fd6316520f4e5b1770752379
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique commonly used for SEO poisoning and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though partially corrupted, mentions 'Comparative adjectives and adverbs pdf' and includes the URLs, suggesting a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://buckhillcoffee.com/uploads/1/3/0/6/130603761/nugote-kisopefino-lisob.pdf
    • http://bendavidsonministries.com/uploads/1/3/0/5/130588962/9aad28ce88f8e6.pdf
    • http://abundantlivingpsychologicalandcoachingservices.org/uploads/1/3/0/7/130776886/xazedugu.pdf
    • http://northeastfjord.com/uploads/1/3/0/2/130271245/tamalomava.pdf
    • http://sisstar289.com/uploads/1/3/0/3/130313064/jisefix.pdf
    • http://absystemsllcscam.com/uploads/1/3/0/7/130738978/130738978.html#comparative+adjectives+and+adverbs+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010a6.bin
36a5895d39e22d9a72fc406665d56b70f2ccfb9a5f1dd5ee0b37edd9e3088398		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6 7520 bytes

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