Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af045d1f3fd7b43…

MALICIOUS

PDF

80.7 KB Created: 2021-03-30 00:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ae9045a6139bd9fea38bcc0032150c4e SHA-1: 72f85cd805368be8dc6950fb2fa3817227a51cd4 SHA-256: 3af045d1f3fd7b43419a46de835d07b6d8d1e6d7641385485868e15041d5641c
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 a primary one pointing to 'kuzutuzo.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=franz+bardon+initiation+into+hermetics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404524/normal_602ab1ffc3c42.pdfIn PDF document text
    • http://igcopyrightverify.com/74527912064qzuoz.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/pioneer_ductless_mini_split_inverter_air_conditioner_reviews9hd2l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456685/normal_5fcf381056a54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450864/normal_5fed46a0cd5a6.pdfIn PDF document text
    • http://repochka.site/border_patrol_agent_job_qualifications0kaer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_603d52c759bdb.pdfIn PDF document text
    • http://voyazh-shina.com/76604937028apcar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468831/normal_60060f403e956.pdfIn PDF document text
    • http://xiluzoxasefeb.iblogger.org/envato_market_bootstrap_templates.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_e7e00c972b984f2d8ae74c14b700c69f.pdf?index=trueIn PDF document text
    • http://wivegetozedogal.epizy.com/21662136277.pdfIn PDF document text
    • http://jusolasoxo.epizy.com/cryptocurrency_trading_guide.pdfIn PDF document text
    • http://fabamej.rf.gd/how_to_read_candlestick_stock_chart.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_1ed46f102aec4b2d91a57c23725a99f2.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_4f0d31f4ba3d45509f84f91ab97fc312.pdf?index=trueIn PDF document text
    • http://parusorudejes.epizy.com/26566017986.pdfIn PDF document text
    • http://vobujilub.epizy.com/45842696863.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_a70a8f3094ca43baa6aef77e2c02fe79.pdf?index=trueIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_ad407de3b0984085b5cbd350326b43d5.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_487a4f21a73c46c0a5fb78e1b48b19b0.pdf?index=trueIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_41b5d5a5580846c9b99994167d630589.pdf?index=trueIn PDF document text
    • http://jinimivunom.epizy.com/accord_guitare_facile.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_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 5292 bytes
SHA-256: 77f57538e658904eb9473d3741fec2439a9fbc288c1b294260d1f25fee8be18f
font_01_sfnt_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 11832 bytes
SHA-256: e097a42ce39dfa26d29b1785940d89cbacd7e4892c7538b441b8b2aef013ef75

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