Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03bcb97cadade19…

MALICIOUS

PDF

76.1 KB Created: 2021-04-08 06:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e15ce1230c0aa60afb1c0f75fb6e12d1 SHA-1: 2c1043a1207614f0adcf28b800ae405ca6e8fdaf SHA-256: f03bcb97cadade19f0c42aa1a79652fa33c5ec6de47996a5d5fef241a56a361a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=logitech+x+540+to+tv PDF link annotation
    • https://cdn.sqhk.co/jeporikate/bjgZnid/sajidunuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471710/normal_606e72293b2b0.pdfIn PDF document text
    • http://jopkapopka.online/14719303622dxl9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467036/normal_60298220ed8b8.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/hfgejdn/jozex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_604b1cda6299d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_603d1a6827ba6.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxogubajo/S8q8ijt/suwegamofelelojodo.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/ijhjeid/link_medical_products.pdfIn PDF document text
    • http://fridgeservice.ru/50499106825uq7ta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5fec68d28fcef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_6056743db9ac6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382189/normal_6005dc0dc66ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464871/normal_603c6b264a714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501233/normal_5ff8d4630f672.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijaros.rf.gd/fender_mustang_25_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2038976f-5868-40cf-9682-b474d9173d8d/bullet_rush_game_mod_apk.pdfIn PDF document text
    • http://nakewifowid.rf.gd/56437776017.pdfIn PDF document text
    • http://pevudavef.rf.gd/coreldraw_portable_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/922144b0-70ee-4465-b36b-1128ca2018c6/10451398913.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_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 4968 bytes
SHA-256: 9afb3d77cda5e44483ed58c5c33977644dac2fe3785a6b4cfa32074e86c0848c
font_01_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 11052 bytes
SHA-256: 9f8e67009856acdfcfa1f8984ecdd018c900e41baec2c863f30577f65714d208

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