Malicious PDF — malware analysis report

Static analysis result for SHA-256 c939a919e712b5c4…

MALICIOUS

PDF

66.4 KB Created: 2020-12-15 08:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3da13b9bcae9d94af389d5f633bff2c6 SHA-1: 834c74c6b6067e4f2a66be0dca09e970c34daa80 SHA-256: c939a919e712b5c424a61fcc7ae90c2bcb94287c09090933af15f93769e2d15c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/123?utm_term=vicksburg+video+channel+guide'. This indicates the document's primary purpose is to lure the user to this external site. The ML classifier and ClamAV detection further support the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffmen.ru/123?utm_term=vicksburg+video+channel+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4451760/normal_5fc85201149a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456377/normal_5fa6dec9b1886.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415754/normal_5fcfe48592ea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_5f94243dba94e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_5f977e665bc92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_5faf77dead963.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/kufazete/putudi.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/dreamweaver_portfolio_website_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/zeus_engineering_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80dba497-350b-4f59-80d8-753c82da2b0f/10939976083.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/56013220499.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3d1f6affbf90a66fcb035/t/5fcd05555d2e6f3bda405d1e/1607271765045/kofozal.pdfIn PDF document text
    • https://s3.amazonaws.com/radaruropivoje/62658348458.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/acne_keloidalis_nuchae_home_remedy.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_off0000c39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39C 5428 bytes
SHA-256: acb7f27ba0ca1211a12c426879f14ae7abd1f7f722cf0a6a12758deef011bf8f
font_01_sfnt_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 11556 bytes
SHA-256: 6c4dfa636a0bc51659b7ead9d4a5a40852b14988a1d0f24046665981234c5213

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