Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c21f095f102764b…

MALICIOUS

PDF

102.0 KB Created: 2021-02-20 02:04:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 73337341586f459c8c1cdacbd0fbc216 SHA-1: e3558bf9783aa270f13de3ed46515657a8287789 SHA-256: 1c21f095f102764b16e3ec4b11f64bd5de4925e3e93b8525b8b8e07709a761bd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://seumenha.ru/strik?utm_term=broan+allure+qs3+range+hood+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369794/normal_5ffed0bc78838.pdfIn PDF document text
    • http://instahelpforbusiness.com/apple_app_store_apk_ziprmlor.pdfIn PDF document text
    • https://cdn.sqhk.co/wedegetuso/sgjjbby/68735778184.pdfIn PDF document text
    • http://netlysy.online/what_is_agile_kanban_methodologyejvdh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495841/normal_6027489eabb0f.pdfIn PDF document text
    • http://hookup153.online/nuliki7wu9x.pdfIn PDF document text
    • https://cdn.sqhk.co/dimosiwela/bAjiWjj/72324342542.pdfIn PDF document text
    • http://am-sound.ru/21810559331ompkq.pdfIn PDF document text
    • http://xovumajinobog.iblogger.org/6727610627.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411937/normal_5ff624c333df9.pdfIn PDF document text
    • http://euroshopmn.space/81295975679digxq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gidufuvez.epizy.com/junuwilunupupo.pdfIn PDF document text
    • http://buvudateba.epizy.com/mannitol_administration_guidelines.pdfIn PDF document text
    • http://muxawij.rf.gd/dovira.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7D 5560 bytes
SHA-256: 1f9e965580272cbf3fd768875e9cf7c80ccbed5df14f036c9c19dd9bfe4d35f6
font_01_sfnt_off00016051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16051 12456 bytes
SHA-256: 38d94e49835932513e514f812bec125ce524c7bbdd398bab8b061bbf0bac2782

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