Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7310758f076d4d4…

MALICIOUS

PDF

81.2 KB Created: 2021-03-16 12:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 40550b51bb231bd1af21ee2ed4b6245a SHA-1: b6b5803dd01d407764dfe730cdab7c734a3236b7 SHA-256: b7310758f076d4d413acb3f3e3603a6165db882e76ba40b01f6fea3e9678b5c2
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful sites. The PDF structure and embedded content, though obfuscated, point towards a phishing or malware distribution scheme.

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://golowaki.ru/award?keyword=biceps+tear+exercises+pdf PDF link annotation
    • http://zdsshop.top/potunatigolepalivn8j.pdfIn PDF document text
    • https://lapokatodulobak.weebly.com/uploads/1/3/5/3/135347459/dumekex.pdfIn PDF document text
    • http://sparzha.club/34381623176fobbk.pdfIn PDF document text
    • http://spencermcman.us/3609337774277ewh.pdfIn PDF document text
    • https://cdn.sqhk.co/jusulikipe/ojhAhyr/mini_manager_soccer_world_cup_perth.pdfIn PDF document text
    • http://agreevudb.rest/nizexenozelisorurerepojub8fl2.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/4ae83680.pdfIn PDF document text
    • http://sexesex.site/dna_structure_review_worksheet5pie9.pdfIn PDF document text
    • https://cdn.sqhk.co/panazomuv/ih4ibtB/lafekuxaxowexedozukije.pdfIn PDF document text
    • http://znakomstva18x.site/13967486185p57w0.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/gyii0ia/paris_texas_pink_snakeskin_boots.pdfIn PDF document text
    • http://shoop-fk.ru/41197361774ztkar.pdfIn PDF document text
    • http://liko-sneakers.com/demon_hunter_pvp_guide_7._3._5b8hpa.pdfIn PDF document text
    • http://semengergel.ru/bowflex_heart_rate_monitor_watch_manualb584t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jatitubez.epizy.com/mamarolupiweji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ab8cb3-58f0-418c-bb74-83ab6ae7a7cf/bedunafow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3628f98-712f-4fe9-9639-e8d7e47abae4/mechanical_properties_of_rock_materials_ppt.pdfIn PDF document text
    • http://karelovaluz.epizy.com/51281124889.pdfIn PDF document text
    • http://remivipe.rf.gd/1672657179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/414e3c8a-e499-4929-83dd-f3cec4d3bff8/13112393117.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_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 5236 bytes
SHA-256: 7f051d1fb7d30c2dd3026cc48226160e1c991f2e5f86ec1e3799b358b66a8fd5
font_01_sfnt_off000112df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DF 10752 bytes
SHA-256: b89ccc0bca8f7fc671cd89f9ab52cf10ec79cb825f9452555732c75fe0da545f

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