Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8812408fc06572…

MALICIOUS

PDF

53.0 KB Authoring application: Smallpdf Desktop
MD5: c788f4b5b691cce454b29e4b6a9b54f5 SHA-1: 1a94a0424660879870cebb0aa5cc8ac688ae85e2 SHA-256: 6a8812408fc06572a2624626c0aec0d513eb06dde21d6d68dac551e050461f35
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified as a PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also indicate maliciousness, with ClamAV specifically flagging it as Pdf.Phishing.TtraffRobotInstall. The embedded URLs likely serve to redirect users to malicious sites or to distribute further malware, aligning with a phishing or SEO-based attack pattern.

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://onlinemobiletrainer.com/uploads/1/3/0/7/130775274/kojavi_modufifikuvale.pdf
    • http://themastectomystore.com/uploads/1/3/0/7/130739069/gunifujo.pdf
    • http://newtampatraillife.com/uploads/1/3/0/6/130620912/6627335.pdf
    • http://literary.cafe/uploads/1/3/0/7/130740590/6007738.pdf
    • http://disdiy.com/uploads/1/3/0/6/130621370/zigolena-wowatibirag-muwokopisiwufu-fuxizadi.pdf
    • http://cabinetdanconsulting.com/uploads/1/3/0/5/130588944/nufutar.pdf
    • http://jonforsh.com/uploads/1/3/0/7/130738978/3552899.pdf
    • http://robertoluigimauri.com/uploads/1/3/0/5/130550966/411970.pdf
    • http://seraphsnightmare.com/uploads/1/3/0/4/130476866/gusaxovojoniwomujagi.pdf
    • http://beautifulthingsbirth.com/uploads/1/3/0/6/130640088/9363175.pdf
    • http://themegahotspot.com/uploads/1/3/0/6/130604141/rageponimop_jetuve_masowevo_sixumew.pdf
    • http://vandutchyacht.com/uploads/1/3/0/2/130271139/da6355.pdf
    • http://signalmtnranch.com/uploads/1/3/0/5/130544547/luzakubupuraviwilod.pdf
    • http://1lbr5v.salon225.com/uploads/1/3/0/4/130488584/130488584.html#derive+continuity+equation+in+three+dimensional+cartesian+coordinate+system
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ffd.bin
53267933d81133df60994881e0139e2b51ac9228ed3d3eb9922f52306323338b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FFD 16108 bytes
font_01_sfnt_off000064cb.bin
f1e3b957755a5adcdea7aca50f6efa6f3a32e9c16b85ba6dff48043a9fed8d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64CB 3768 bytes
font_02_sfnt_off0000749c.bin
439868681a2235bb9cb7ead978b72bf62f5174efb000ab2fb6c8a823a1ef779a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749C 8680 bytes

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