Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f9a3e1878010fd…

MALICIOUS

PDF

38.6 KB Authoring application: Pdftk
MD5: 26e29949244904110d5e44e6be98c0d6 SHA-1: d5ac0dc63bdda5aa008ee660119044ae69e9fcf4 SHA-256: d8f9a3e1878010fd5c55e6d1130996eafc9356831abfedc2a5b484edb2fdce77
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded URLs, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic PDF_SEO_LINK_FARM specifically identifies the mass external PDF link farm as a critical finding.

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://greenmeadowsfarms.org/uploads/1/3/0/6/130622024/mifeni-kofaw-vuvedonivirogew.pdf
    • http://mkrbd.net/uploads/1/3/0/6/130604016/b0e521.pdf
    • http://schoolmenuboards.com/uploads/1/3/0/6/130621501/d0f0b.pdf
    • http://nutritionbylaurann.com/uploads/1/3/0/6/130621392/duxezed.pdf
    • http://thistletransmission.com/uploads/1/3/0/2/130272424/gividapugizob.pdf
    • http://www.ifabroad.com/uploads/1/3/0/8/130874157/e8c51c5da2e8b84.pdf
    • http://slonetelecom.com/uploads/1/3/0/3/130313358/vokuwitu.pdf
    • http://www.justinarndt.com/uploads/1/3/0/2/130272362/volasugirimenagoj.pdf
    • http://streamkingztv.info/uploads/1/3/0/2/130272462/2d2cc.pdf
    • http://cauler.com/uploads/1/3/0/5/130538986/xiwera.pdf
    • http://www.colaboralider.com.br/uploads/1/3/0/9/130969499/5970573.pdf
    • http://healthscoot.com/uploads/1/3/0/8/130813855/aae7553f28c605.pdf
    • http://fiafw.com/uploads/1/3/0/4/130476976/0fbbe1.pdf
    • http://lonelyheartscvlt.com/uploads/1/3/0/2/130272435/dujevigigeraw_jazorusukap.pdf
    • http://a-listcbd.com/uploads/1/3/0/5/130544390/9438588.pdf
    • http://rebeccarankinyoga.com/uploads/1/3/0/7/130739597/zifabezixiti.pdf
    • http://golbaltravelpros.voyagerwebsites.com/uploads/1/3/0/6/130639534/130639534.html#6th+grade+math+pre+algebra+worksheets

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f3e.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3E 2652 bytes
font_01_sfnt_off00003b18.bin
9f76b5cee91bfbdb94d3f9014cd070c744c38eb919a532f652bb6e45a17aea2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3B18 7956 bytes

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