Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4aa749097ab12b…

MALICIOUS

PDF

76.7 KB Created: 2020-12-17 13:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 078045090f4e64ba74c3c829cf489e2d SHA-1: 6c121daac9066617686a26f861a427fd8fe0fb47 SHA-256: dd4aa749097ab12be360fc4412d4cf972cb6b781fb6a418bf9757778a8593290
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to a textbook, likely a lure to encourage users to interact with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://trafficel.ru/strik?utm_term=conceptual+physics+textbook+12th+edition+pdf PDF link annotation
    • https://jobikituloxexe.weebly.com/uploads/1/3/4/4/134456837/4bd996c6e6bee53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405179/normal_5f92abb41d885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f8a4cec43643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5fa5a7cc62f7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444648/normal_5fbf34c17b4b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487386/normal_5fab961d2f8c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393762/normal_5f8ebcef28a4f.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/pexodugosa/48372953068.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/susegelinelovomawiverubal.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/45525294938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15c42932-df0f-42d1-b300-12ed81626733/chris_watts_interview_transcript.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 5608 bytes
SHA-256: 7d2113ae867ccb92d3cce6c82d293994d7ee7cb5fd90043a8e82aa018c65d050
font_01_sfnt_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 11280 bytes
SHA-256: 4584fb29be8e751326d421ef04bebf373dca6917f475c49900fcf2623db1d1e8

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