Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb731e31d05f96ff…

MALICIOUS

PDF

67.2 KB Created: 2020-12-02 11:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: dec2840acace3fe85b51aeefece4b577 SHA-1: d0cf77089156938eba56bacf0158b45da37ed152 SHA-256: fb731e31d05f96ffcdea0f18de1c3c708a0b958eab58b68ae65297624d88ea20
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/strik?utm_term=type+10+defender+hardpoint PDF link annotation
    • https://fadufavibog.weebly.com/uploads/1/3/4/8/134889314/doxosanodiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_5fa7dac46a966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_5f8c12fbabecc.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/4546498.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/vinatutamupixa-novexufupibo-muzeza-laniwowijijizuf.pdfIn PDF document text
    • https://rusigeju.weebly.com/uploads/1/3/4/5/134596119/zudiwud.pdfIn PDF document text
    • https://mipumitazolepi.weebly.com/uploads/1/3/4/4/134495795/559955.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/f50383d9742fa4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc532fde2fce462bca7fa8a/t/5fc6fb592ac13f1ee9af35cc/1606875997592/reuge_dancing_ballerina_music_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/341bf0e5-9b44-40a3-be85-20775d5c5b1e/ue4_trigger_volume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/391b4613-9350-4722-8c58-e17890673d73/easeus_data_recovery_wizard_trial_license_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56b8094-01f6-4ac6-a199-98a7b37829dc/map_funding_usda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3162ed68-c4a1-4b50-bac7-38ecd540a052/megijuf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0b0c4f98375720a790c2/1606290189318/vudizogaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73130d3-6daa-4315-bf0e-33b3ba80fdff/cooking_mama_recipe_list.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_off0000c8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E0 5164 bytes
SHA-256: 5f16dd3be5e5d915ed0c0e566a6bf570990ea292f6098d1e9d7da5aad221fd2e
font_01_sfnt_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 10540 bytes
SHA-256: fabd523dbe9735e1cc25ba1514a0c67b472fc20e3c435e9c8eb7876c53dcf309

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