Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f8dd61e70d2d48…

MALICIOUS

PDF

77.0 KB Created: 2021-03-19 10:08:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: eab4eb175f0389b72791a6021893b473 SHA-1: 21d9579b75a7d79bf3c9468a95910de9350ce790 SHA-256: 31f8dd61e70d2d486d8ce1b2b8d7c383ca50a303505429c5c13c235143c8a082
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is part of a link farm on disposable hosting.

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://resalured.ru/strik?utm_term=bulova+marine+star+blue+review PDF link annotation
    • http://jirenaxapibetig.scienceontheweb.net/world_war_z_game_crossplay_ps4.pdfIn PDF document text
    • https://vabomunebalobi.weebly.com/uploads/1/3/1/8/131856010/nogik.pdfIn PDF document text
    • http://options.expert/82199534172v2yck.pdfIn PDF document text
    • http://vizemezezu.sportsontheweb.net/sirijoxufilapekasudole.pdfIn PDF document text
    • https://bifotuvimutojuz.weebly.com/uploads/1/3/0/9/130969437/xisapem-losofopem-jesedivuzij-pijaxepodogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_604d2c782bd06.pdfIn PDF document text
    • https://temabodanifow.weebly.com/uploads/1/3/1/4/131454916/wevaladimava.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/34729851845.pdfIn PDF document text
    • http://loveantravel.xyz/brother_p-touch_pt-900_wlsjfs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_603f5a9c1f6db.pdfIn PDF document text
    • http://wugupomovupa.sportsontheweb.net/fumudewoxefiki.pdfIn PDF document text
    • http://fafabil.getenjoyment.net/financial_analysis_report_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/fanoxeza.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/90269762904.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/al_que_esta_sentado_en_el_trono_acordes_faciles.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_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 5172 bytes
SHA-256: 838a2ca2032f4fd77fc05109d8b206ec9d6f98bf2e8d0284646b76a1e8f66810
font_01_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 10756 bytes
SHA-256: c41ad057de56e464a13fb6dd3161dae8436c6dc192148252de9bc01a4b1208cf

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