Malicious PDF — malware analysis report

Static analysis result for SHA-256 44619fea53ec0c20…

MALICIOUS

PDF

83.4 KB Created: 2021-06-07 13:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f0c3a1f389d899dc2cd01c98e91884e SHA-1: 94cb746b50cab75e779c452a7edd99f1aa798e97 SHA-256: 44619fea53ec0c20d8bca4e0ddd0ae068d1385361973d158ae8dc2d43db3c234
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pixomot.ru/pbw?utm_term=reach+for+the+skai+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480758/normal_604da5a9ee276.pdfIn PDF document text
    • https://gumelajijepepa.weebly.com/uploads/1/3/4/6/134639918/vofimasovej_fejikametifu_winalareb.pdfIn PDF document text
    • https://nowoboxemubo.weebly.com/uploads/1/3/4/8/134893539/9167311.pdfIn PDF document text
    • https://masagefila.weebly.com/uploads/1/3/4/5/134505888/fevemed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443610/normal_5fdfd33f5a627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_606d548683da0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473963/normal_601d897700881.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funuvutidip.pbworks.com/f/skeletal_system_review_sheet_answer_key.pdfIn PDF document text
    • http://dimutojopog.pbworks.com/f/7576323488.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/f/36_questions_to_fall_in_love.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/w/file/fetch/144562206/pride_and_prejudice_sheet_music_piano.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/f/are_hot_tub_jets_interchangeable.pdfIn PDF document text
    • http://lulatigono.pbworks.com/f/21548114417.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/how_to_tell_if_injection_pump_is_bad.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144424209/how_to_forecast_cash_on_balance_sheet.pdfIn PDF document text
    • http://medodadepud.pbworks.com/f/how_to_watch_dc_movies_in_order_of_story.pdfIn PDF document text
    • http://dipazuwawex.pbworks.com/w/file/fetch/144596589/91407747626.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 5404 bytes
SHA-256: 41a8e97879dbe23a0399b54c0bb373b4a5ccea796c2dccfe250d8e7e3da129c6
font_01_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 12556 bytes
SHA-256: 336b221bcb5e1cf8289c86411166b95b0fe992b6b6a14dcbe8efb28046ab7d7c
font_02_sfnt_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 16144 bytes
SHA-256: f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29

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