Malicious PDF — malware analysis report

Static analysis result for SHA-256 8211c32f7fc09835…

MALICIOUS

PDF

37.5 KB Authoring application: PDFedit
MD5: 73e4c64fcccf234e6b26fd4e418d8182 SHA-1: 7e6281b094d117949962ec76cdfda06b94ce0471 SHA-256: 8211c32f7fc09835626059929ccad3312793679830f2bd345098ab218292a4c3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to other PDF files, indicative of a link farm used for SEO poisoning or distributing further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded URLs are the primary indicators of compromise, suggesting a multi-stage attack where users are enticed to download additional malicious files.

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://hellokendall.com/uploads/1/3/0/6/130620728/3f8682e7dd.pdf
    • http://mysoulsingsstudio.org/uploads/1/3/0/6/130640040/9963935.pdf
    • http://netdevl.com/uploads/1/3/0/5/130589230/poragebavimo.pdf
    • http://muslimsjobs.com/uploads/1/3/0/6/130603832/biwalez_rijeladedakut.pdf
    • http://milesalumniatl.com/uploads/1/3/0/7/130738870/e9e82814fa.pdf
    • http://mustoelaw.com/uploads/1/3/0/4/130435884/xepepigat_juvat.pdf
    • http://emilyburdettphotography.com/uploads/1/3/0/4/130476288/4fd9e7ceaa48.pdf
    • http://newcenturyplayers.com/uploads/1/3/0/6/130639082/cf56b917a.pdf
    • http://asociacionperiodistaspr.org/uploads/1/3/0/7/130776585/130776585.html#oxford+english+grammar+book+online

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011f3.bin
80e2f0bf3eca743190c84b5927500ccbe4968303f6d576ab8aa3e3728a5fd909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3 8848 bytes

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