Malicious PDF — malware analysis report

Static analysis result for SHA-256 10394ec7b02ab764…

MALICIOUS

PDF

76.5 KB Created: 2021-03-20 15:34:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 75296a099f18fccad0de73ecd87220e5 SHA-1: c543b8a3ec0fc7504a5097a2276390fcbfbe87a5 SHA-256: 10394ec7b02ab764fe899e75ed983149ea0e132593186e309113fdd89a1231d2
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/award?keyword=anne+of+green+gables+movie+script+pdf PDF link annotation
    • http://fekevopimibun.sportsontheweb.net/project_management_books_to_earn_pdu.pdfIn PDF document text
    • http://onlinekartiadesi.com/sadizoxupolodu9buh7.pdfIn PDF document text
    • http://tersq.space/writing_in_the_biological_sciences_hofmann9tfv3.pdfIn PDF document text
    • http://niwifara.22web.org/list_of_star_trek_movies_with_original_cast.pdfIn PDF document text
    • http://tajawuxelefa.22web.org/11476258830.pdfIn PDF document text
    • http://nikaold.site/chemical_guys_waxing_guides42hg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_7e0f1cd0daba4f7aab9958ac131f9c3a.pdf?index=trueIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_2ab909019dad4a0ea8f52666fffeb654.pdf?index=trueIn PDF document text
    • http://kepagewav.atwebpages.com/how_to_pair_jlab_neon_headphones.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_a2017e5a887c4dceac73a37f2f809222.pdf?index=trueIn PDF document text
    • http://xutenujute.myartsonline.com/el_mundo_fragmentado_cornelius_castoriadis.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_c997057fe0b24f7f8cecc98b48a26430.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_5fe246e7459b4d9f91083be335aa527d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xesigeze/wilisulerekate.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/87745435690.pdfIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_594ce0b0f4c9484287fda3e314e67d4c.pdf?index=trueIn PDF document text
    • http://rojaxenutu.rf.gd/kindergarten_reading_comprehension_worksheets_free_printable.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_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 5664 bytes
SHA-256: 20ba9b0ab0ed77bfd7750febcca57e4f85c636abea2422d176cf390d4cada9be
font_01_sfnt_off00010012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 10612 bytes
SHA-256: d6dbc605274b07d4ee7a1919ac55098b9be1bdcdccc35d9d0cd94b244f1b5394

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