Malicious PDF — malware analysis report

Static analysis result for SHA-256 33574988b53094d9…

MALICIOUS

PDF

37.0 KB Authoring application: Karbon
MD5: e0bfdb757b7fd796580fa5b0f48182dc SHA-1: 683ad350d9317bfa6ab703c92c57074f678d345c SHA-256: 33574988b53094d98c435ce63e9dd09a66fc8745c0f4a1cbb38b9fbe890c7fb3
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to external PDF files hosted on various domains, a technique commonly used for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies the mass linking to external PDFs as a critical finding, suggesting the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://eipef.com/uploads/1/3/0/7/130740508/gupixuko_rosizetiged_budujijab_nukani.pdf
    • http://gothicartstudio.com/uploads/1/3/0/7/130776147/xesulebajitu.pdf
    • http://www.myyogamadison.com/uploads/1/3/0/4/130483900/guwijej.pdf
    • http://www.whitegravity.com/uploads/1/3/0/6/130639729/51eaaf8db5694.pdf
    • http://cpanel.chronicboomdelights.com/uploads/1/3/0/7/130775782/e013c351bddcd.pdf
    • http://novaoraldesigns.com/uploads/1/3/0/5/130551287/beferelak.pdf
    • http://www.sylvz.nl/uploads/1/3/0/5/130539654/664a07ce9f7.pdf
    • http://www.outfitcoach.de/uploads/1/3/0/9/130969079/binoxikinizi_kugiponeped_mofekita.pdf
    • http://numinersfootball.com/uploads/1/3/0/3/130313090/9686987.pdf
    • http://graywolfmedia.org/uploads/1/3/0/5/130551343/lebewinu.pdf
    • http://indian-student.net/uploads/1/3/0/6/130620986/cd7b2262d.pdf
    • http://farmerspizzeriaqueens.com/uploads/1/3/0/4/130483345/kuzuwefijorijigopow.pdf
    • http://destinationhawaiiwedding.com/uploads/1/3/0/7/130775758/4848948.pdf
    • http://datanetguatemala.com/uploads/1/3/1/0/131071243/131071243.html#is+warhammer+40k+inquisitor+martyr+worth+it
    • http://graywolfmedia.org/uploads/1/3/0/5/1

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000034e2.bin
61f5a9fdaabb50f50fc3d7aea8bd8e55a129fcf46dcfde39401a1054d7b07b9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x34E2 8944 bytes

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