Malicious PDF — malware analysis report

Static analysis result for SHA-256 8833f05958ade884…

MALICIOUS

PDF

130.5 KB Created: 2021-04-16 16:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5bd7e55d1fa7af70c2dddff0a220f017 SHA-1: 85094335cf5dd880d093d7689f8257878901dc19 SHA-256: 8833f05958ade884af46b674a3f91d83651d150d3a37d60488498f88d2390587
186 Risk Score

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 0.9988

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=love+yourself+trumpet+part PDF link annotation
    • https://diwekivoveludu.weebly.com/uploads/1/3/5/3/135313391/vodiwijagirev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461780/normal_60314d753b826.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464080/normal_5ff123cce5eda.pdfIn PDF document text
    • http://skout.tech/creepy_nights_at_freddy_su2cg4.pdfIn PDF document text
    • https://vaxevadokipab.weebly.com/uploads/1/3/4/6/134610393/basulutufibos.pdfIn PDF document text
    • https://mubonunegaj.weebly.com/uploads/1/3/0/8/130874179/baa9404effb0d7.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/8961637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403680/normal_60584ded1c37a.pdfIn PDF document text
    • http://allerop.xyz/91337115694bg7ka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419826/normal_6030df493eba2.pdfIn PDF document text
    • https://wikexedijul.weebly.com/uploads/1/3/4/6/134659224/1863d17b88df68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_60491a2370f48.pdfIn PDF document text
    • https://nexonurobev.weebly.com/uploads/1/3/4/3/134371674/xolaso_zikulivado.pdfIn PDF document text
    • https://lerugusenexeke.weebly.com/uploads/1/3/5/3/135317851/retukakomogaf.pdfIn PDF document text
    • https://vonufire.weebly.com/uploads/1/3/4/5/134596457/9729330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472773/normal_6065c944f1636.pdfIn PDF document text
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/misexixujux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373782/normal_5ff2e3d8def50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nonipesikiri/interrogative_adjectives_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/admiralty_chart_symbols_guide_5011.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/manual_turtle_beach_px4_portugues.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4F0 3256 bytes
SHA-256: d7dd1bb3eb268cfc48ea855777a082753d355b76e54fb924b49c49fe4d4d63d0
font_01_sfnt_off0001b0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0A9 4880 bytes
SHA-256: 386699ce2d7c696e9a4b377a39c5153f530a6d2837b445e3c9603eb87f39fbb1
font_02_sfnt_off0001c159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C159 14544 bytes
SHA-256: 5cb0de9dac110b83dd3cfab7af8d9391768b63c581f573332ffef057c350e6e9
font_03_sfnt_off0001ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE0A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3