Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4332688bdec4e69…

MALICIOUS

PDF

77.2 KB Created: 2021-02-15 15:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a4a2efb690e0981a6d078deaeb6e5e88 SHA-1: 812553e5136d586a0a6375f619318690ceababc1 SHA-256: d4332688bdec4e6958b71a9f7ed60d0908a8a75e7dd3c4ae7a1a6214338dc507
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

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://seumenha.ru/strik?utm_term=why+we+can%2527t+wait+pdf+free PDF link annotation
    • https://cdn.sqhk.co/wimiwupo/jfeOgdg/tufovuki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373239/normal_5feb964fafb0b.pdfIn PDF document text
    • http://bestsalestoday.xyz/barbecue_grills_sold_near_mes8x70.pdfIn PDF document text
    • http://sarelalitodidi.66ghz.com/canadian_election_platform_2019.pdfIn PDF document text
    • http://alisaborodaenko.design/488273834402ks6.pdfIn PDF document text
    • http://fojenuf.iblogger.org/converse_alta_plataforma_piel.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/NjjtjjV/48640113303.pdfIn PDF document text
    • http://takodevizol.iblogger.org/45134663865.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/ibjciaE/65677053675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447431/normal_5feb1d3067805.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/jhahbgd/sanupid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dodarululi.epizy.com/accounting_equation_example_balance_sheet.pdfIn PDF document text
    • http://nowavef.epizy.com/90455870051.pdfIn PDF document text
    • http://tosodesuvivat.epizy.com/ielts_speaking_topics_with_answers_2019.pdfIn PDF document text
    • http://guziruxasa.epizy.com/alien_vs_predator_game_pc_free.pdfIn PDF document text
    • http://bexituxupogetav.rf.gd/android_9_for_oppo_f7.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/central_air_conditioning_systems.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_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 5276 bytes
SHA-256: 2e4ec97a0cd06707570037a172fcfc963342077ed9208664d35575ed92e77b86
font_01_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 11632 bytes
SHA-256: 28a153547f6ea0b3405dede0be8c8f1c3b1ee1740ee9492eee1438354f2b9a58

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