Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9b09ee584c0378…

MALICIOUS

PDF

78.2 KB Created: 2021-05-14 19:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 18f5f940e792b6af7f5a043943b9d9cb SHA-1: 2598cf656f92657e3f474c59c55e4df04286ea01 SHA-256: 2f9b09ee584c0378f289c44071a1bf9d8fef878736fcec845bab9c38c639cda5
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://xajibur.ru/strik?utm_term=tv+show+pitch+deck+examples+pdf PDF link annotation
    • https://cdn.sqhk.co/jasurisunav/icgdhix/retro_game_box.pdfIn PDF document text
    • http://bupitubegedew.getenjoyment.net/77737488188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_601b7e9e375d2.pdfIn PDF document text
    • https://cdn.sqhk.co/xezalagefog/hqjeieu/semple_kneebone_algebraic_projective_geometry.pdfIn PDF document text
    • http://wudaxozibutix.sportsontheweb.net/spoken_english_book_in_bengali.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417140/normal_5fed9dd2e5b1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pasulupumorowim.myartsonline.com/esercizi_just_already_yet.pdfIn PDF document text
    • http://vizomonuzujo.onlinewebshop.net/84545372738.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_c2dd6c3427484b5aa984429355012be1.pdf?index=trueIn PDF document text
    • http://bepolujogox.atwebpages.com/ganimefojikeluditifijo.pdfIn PDF document text
    • http://negumigimewote.onlinewebshop.net/52773698218.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/76572621538.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/nokolifeja.pdfIn PDF document text
    • http://nabulegewuwal.myartsonline.com/what_is_a_career_in_management_consulting_like.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_490617ab4efd41c3abe7fdb3829d6bb3.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 5216 bytes
SHA-256: 3dd8a9ce6d860a24316d7c3c281dd9f42d801fb0666dbc073eb4868720606808
font_01_sfnt_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 11472 bytes
SHA-256: fd3837152b95003408bcc000ee414997084ea4dc979e70d4da950f1fa2ce81f7
font_02_sfnt_off00011dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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