Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5c8d96f3827424…

MALICIOUS

PDF

83.2 KB Created: 2021-01-08 13:58:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9f5dcf7d42671c4426abbeccd0e70ca4 SHA-1: 197daf0faa0db485e013b7d5bbd9de3b33dc641c SHA-256: bb5c8d96f3827424857e8dc53d9948dcc8262b38fccaf3aa9fda7e1323a915cb
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicating a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'conditional operator in c pdf', suggesting a lure to disguise malicious intent. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://trafftec.ru/aws?utm_term=conditional+operator+in+c+pdf PDF link annotation
    • https://wozavosasegug.weebly.com/uploads/1/3/4/5/134509229/6853225.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/fasidevawuwuze_lumimurifag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fd30e5833c2a.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/jibiro.pdfIn PDF document text
    • https://mutuvedaluvop.weebly.com/uploads/1/3/1/8/131856278/c0d7aa88e.pdfIn PDF document text
    • https://benesigonej.weebly.com/uploads/1/3/1/6/131607635/d3097eb3c9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f9271d82243f.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/5401885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muxegeza/27573590990.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/texans_injury_report_week_11.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/69701151288.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/jeladaxut.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/refarimofefawipujirix.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/email_introduction_template.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C91 4876 bytes
SHA-256: c0366d00f94e7f7a7c5e377d2e5523c9e2d91a2dc066f513e294b1b5c6f7e7d8

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