Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d5af635509f6a1…

MALICIOUS

PDF

34.5 KB Authoring application: LibreOffice Draw
MD5: 7c8b1bb56128763fa2e5327c11bfaca6 SHA-1: 4ebc0fd5ed6037d1803ea9ef15c8ad2c8b169524 SHA-256: 71d5af635509f6a1bad11399c0ede668dfd4ca7e5ea387e592b27fb4150c22e7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to other PDF files hosted on various domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malware. The ML classifier and ClamAV detection strongly support a malicious classification.

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://acsnutritionfitness.com/uploads/1/3/0/5/130538986/gagaziwevutil.pdf
    • http://www.nswminiaturepony.com.au/uploads/1/3/0/5/130588937/1008835.pdf
    • http://standrewlutheranportsmouthva.com/uploads/1/3/0/2/130288402/sifigi.pdf
    • http://clevelanddss.com/uploads/1/3/0/3/130323567/0d0f251660426.pdf
    • http://mystreetstamp.com/uploads/1/3/0/5/130538941/cadb8065822.pdf
    • http://alexandraresmerita.eu/uploads/1/3/0/6/130605107/rekimiferurun_wisit_vizegob_nofoxet.pdf
    • http://northcoastmineralco.com/uploads/1/3/0/7/130776131/367d44d84da20e.pdf
    • http://m.janicedunhamskitchen.com/uploads/1/3/0/4/130483134/tavawad-nixijenajad-regonolek.pdf
    • http://imaginaryrats.com/uploads/1/3/0/4/130436494/53d52cf674.pdf
    • http://texasstocklawyers.com/uploads/1/3/0/2/130271111/2581906.pdf
    • http://listenupmedia.net/uploads/1/3/0/3/130379673/nisafakenu.pdf
    • http://parattack.org/uploads/1/3/0/4/130435503/7646660.pdf
    • http://nochemicalsneeded.com/uploads/1/3/0/3/130313582/lazolek.pdf
    • http://midlifewithmoxie.com/uploads/1/3/0/6/130640066/niwukavisi-gesib.pdf
    • http://floridarealestatemarketing.com/uploads/1/3/0/6/130620899/1fb7d62be6af3.pdf
    • http://guoshengwangshangyule.br3h.com/uploads/1/3/0/5/130551967/130551967.html#perimeter+area+and+volume+worksheets+for+4th+grade
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000188d.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x188D 16204 bytes
font_01_sfnt_off00002fae.bin
0c39129355a8da9a7c05d8a2eafa2de907c20685add1e28cecaeb3e028bcd174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2FAE 6348 bytes

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