Malicious PDF — malware analysis report

Static analysis result for SHA-256 20496b0c04715f39…

MALICIOUS

PDF

81.3 KB Created: 2021-03-03 16:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3cb74a3c70989dcefe46727bc5d470f7 SHA-1: a4fbc69c1b371c4254d24aba2718d41dbee53049 SHA-256: 20496b0c04715f399886a78ef8add5c8a900c0ac1c2792e0cd40b4a81f03f107
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO spamming tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external links implies an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/strik?utm_term=mysql+for+beginners+-+self-study+course PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452217/normal_5fede08e1f486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485813/normal_5fd6772fe395d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5fffa0c772b53.pdfIn PDF document text
    • https://wixapikolomuv.weebly.com/uploads/1/3/4/7/134746431/0888d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5fd7880f5520a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_5fe693b727895.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5ff488a171558.pdfIn PDF document text
    • https://cdn.sqhk.co/gutejalajige/ghv7drp/monster_bash_pinball_for_sale_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/9cYVjbN/gusulomotamefuwidelufez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480397/normal_6031f52de0347.pdfIn PDF document text
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/e6aad98191901.pdfIn PDF document text
    • https://lopadedabebaf.weebly.com/uploads/1/3/4/8/134897987/85a470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501374/normal_5ff90e2584ec9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453098/normal_5feee44c22a45.pdfIn PDF document text
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/midumigixumijilegusa.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/hbuHjhE/nixaweberox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381294/normal_5ff8ac140b550.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 5384 bytes
SHA-256: 613e1a70ca13c436b665b999c884447f8caa70c6d700646ad81baefb0950fe67
font_01_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 10784 bytes
SHA-256: e6d1b3cd1dd4b3a8e9b06b42b01ccaf20ac1e3a9473bd33ea64805e06be20f61

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