Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cbf1bb2c4148ab…

MALICIOUS

PDF

67.2 KB Created: 2021-03-28 23:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a4ec27c777c8e79b10e25e226ef2a819 SHA-1: f3ae495850fe401235661c500e7011a692c68a7f SHA-256: 83cbf1bb2c4148ab9f1a0eee1d3090d20d181b955671146cd39bb06c8b1cf82a
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a domain ('mezovuduw.ru') flagged as suspicious and associated with a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

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://mezovuduw.ru/award?keyword=acuerdos+de+basilea+pdf PDF link annotation
    • http://bafezixulu.22web.org/how_to_program_black_and_decker_coffee_maker_cm2020b.pdfIn PDF document text
    • http://meetsoda.pro/plantronics_voyager_legend_uc_b235-m_driverwr2k3.pdfIn PDF document text
    • http://pl50off.info/civilization_3_for_androidskcva.pdfIn PDF document text
    • http://dorightunion.com/at_t_pay_my_cell_phone_bill_onlinefjogt.pdfIn PDF document text
    • http://naziniza.22web.org/mutizutufenadulababipej.pdfIn PDF document text
    • http://pinerapidsrr.com/xokosuxonakasopidezowef.pdfIn PDF document text
    • https://cdn.sqhk.co/rorexamuviz/ic6XeUw/36312482999.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/iggghjd/road_riot_mod_apk_unlimited_money_and_gems.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b382a7-b6cf-41cb-b881-1a4a02fe6f33/2005_dodge_ram_1500_wheel_arch_repair_panel.pdfIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_9c73933fe34541fcabf19de242e9b5a5.pdf?index=trueIn PDF document text
    • http://movalezipukud.epizy.com/remington_chainsaw_replacement_chain_16.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_f9ef87780d364fcb8ace820b4878627a.pdf?index=trueIn PDF document text
    • http://nilifejafajow.epizy.com/analytic_geometry_and_calculus_2.pdfIn PDF document text
    • http://gatinilub.epizy.com/dusirekomobujuvorefotada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0eabf6-0a5c-4a57-aa40-7e00c7c4367c/flysky_fs-t6_manual_espaol.pdfIn PDF document text
    • http://dufijofitaj.epizy.com/stemi_guidelines_escardio.pdfIn PDF document text
    • http://sotuwekelog.epizy.com/wulomes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82b33806-7aec-4415-9088-0604be436147/70866481807.pdfIn PDF document text
    • http://gibapomidumitar.rf.gd/is_true_detective_on_netflix_or_hulu.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_off0000ca02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA02 5276 bytes
SHA-256: e287f62832f0b663c3f7222b6bd11da607a7ebb5cecc4500ecd853d0a6fec0b5
font_01_sfnt_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 11036 bytes
SHA-256: 31cb87952035d0009df659f4ed55385cb5c57f3ecd9c84fa71c7f06a57e9523a

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