Malicious PDF — malware analysis report

Static analysis result for SHA-256 80791d6c57d98ff5…

MALICIOUS

PDF

38.1 KB Authoring application: GIMP
MD5: e567b9d3f1098eb6556359fee469038d SHA-1: 4d6c4c29c6e9d41240712dce30aae95e0131aff1 SHA-256: 80791d6c57d98ff59ce2577476c78672259b8bac88bf0350b61429e77b0a7a9d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs pointing to external PDF documents, as indicated by the PDF_SEO_LINK_FARM heuristic. This suggests a tactic to manipulate search engine results or to distribute further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as phishing-related.

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://sitefurnishingpros.com/uploads/1/3/0/4/130477915/wubokib.pdf
    • http://jshawamtmann.com/uploads/1/3/0/3/130323984/9773779.pdf
    • http://cosmetology.studio/uploads/1/3/0/6/130639687/danuxivawugexajuzipa.pdf
    • http://launchcommunication.com/uploads/1/3/0/5/130551231/7593490.pdf
    • http://arnosrepairs.com/uploads/1/3/0/5/130539408/c52191d.pdf
    • http://rockinghamprecisionmetalworks.com/uploads/1/3/0/7/130739773/971f1cf0c.pdf
    • http://www.marcobertolini.org/uploads/1/3/0/6/130639784/kuwuzetewigej.pdf
    • http://www.tch318journals.com/uploads/1/3/0/5/130542853/bawemizabuvulo_gafezagose_zekogenupuwinis.pdf
    • http://svdptc.org/uploads/1/3/0/6/130620402/8979027.pdf
    • http://chongai520.com/uploads/1/3/0/6/130620482/5d6d70ce.pdf
    • http://911bodyrescue.com/uploads/1/3/0/5/130590438/viretibipebis-zamusoxu-zelodud.pdf
    • http://leguyule.br3h.com/uploads/1/3/0/7/130739926/130739926.html#crossover+and+mutation+operator+in+genetic+algorithm
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f8b.bin
4d9ec2aec8f1ca6bebe1b56492fd55a77bba3a6e98efb76508c1b835d4eb9912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F8B 2860 bytes
font_01_sfnt_off00003c53.bin
cab519834910587bf10c82a55aba63e9c8faf27efe3afc4036a3dc9e6573ce0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3C53 8428 bytes

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