Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bb330a6d10c119…

MALICIOUS

PDF

46.5 KB Authoring application: Smallpdf Desktop
MD5: c37326107c8b1c9e2e35ff42aff6bd69 SHA-1: 77cc0a99ce7a64e19491251450343fde0f577f87 SHA-256: 66bb330a6d10c1193490746edd4cdd13628edd3ef6b10bdb39fa175317c26ea5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass of external links, identified as a link farm, with the primary purpose of directing users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. The embedded URLs are the most critical indicators of compromise, likely serving as lures or download locations for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://minhavidaminhasescolhas.com/uploads/1/3/0/5/130588360/fonuginaz.pdf
    • http://bluesmasters.club/uploads/1/3/0/2/130287914/bozelefuxosibo.pdf
    • http://eidointernational.com/uploads/1/3/0/3/130323900/715ecc6b57639.pdf
    • http://agencia-de-empregos.com/uploads/1/3/0/5/130551585/f596fb48.pdf
    • http://somersetfoodtrail.org/uploads/1/3/0/7/130776735/130776735.html#chiltepino%27+s+pabell%C3%B3n+reforma+hermosillo+son
    • 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_off000010e2.bin
51049ba0f17e5a066ac3c217eecae5781e2c43920b76b30c06e28469587d5c78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2 9612 bytes
font_01_sfnt_off00007b70.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B70 2652 bytes

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