Malicious PDF — malware analysis report

Static analysis result for SHA-256 94113a2a47ffbc70…

MALICIOUS

PDF

80.4 KB Created: 2021-05-10 07:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e035da47e502d0cd29ba558dcb18a5a3 SHA-1: 4c54773ad054b3645a227a6aaef4456ab9b73187 SHA-256: 94113a2a47ffbc70e32ccfe86bdc91dee7e0b2d98d1a1a3f0030440de86dba62
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute malware.

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 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://druttle.ru/strik?utm_term=onn+dab+radio+bluetooth+portable PDF link annotation
    • http://cz-nitrof.website/bolugoku55pm2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366987/normal_600564c826b52.pdfIn PDF document text
    • http://idealica-official-it.website/49411179660h6r48.pdfIn PDF document text
    • http://medicinfo.online/425124284129etq6.pdfIn PDF document text
    • http://idealica-ituficiale.website/g_shock_rangeman_battery_dead6atx0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_6065a34c88dfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408588/normal_6037cc4894bfb.pdfIn PDF document text
    • http://pribor-poverka.site/5391883581194yrg.pdfIn PDF document text
    • http://homearfes.com/bottle_shock_movie_freemya7d.pdfIn PDF document text
    • http://futup.ru/rogajud9y8hn.pdfIn PDF document text
    • http://pet-guru.shop/40321738214g9i2j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384035/normal_60062a28818aa.pdfIn PDF document text
    • http://blockhcain.host/example_essay_report_environment_weekcx9aq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_e2d4ffb9dca144e89f45a491b4573ef2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5d64ee-5359-4f0a-946b-6a27a22e613c/limevapoguzajefomo.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/why_is_dishwasher_not_drying_dishes.pdfIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_35a2b936b98048c0b2edb5fabf29e8d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea46d781-2260-4957-be7c-53e067b69d85/91750900916.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/define_manual_and_computerized_accounting_system.pdfIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_ad8998e5dcc74c559587ff3675b5b6fa.pdf?index=trueIn 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_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 5036 bytes
SHA-256: 439951720905cbf83ccdc6406aaf75820ef677fb3e7c7cb6620d2eb67d12dfd5
font_01_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 12168 bytes
SHA-256: 964433f4974781fb7c1ca487af579bce044255089384971779e1c627df98ad89

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