Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b6899060e332fe…

MALICIOUS

PDF

78.5 KB Created: 2021-03-09 00:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 60415aec9a863dab4a2a28409beef569 SHA-1: 754d88b8b521f73313f8e129e86629a855c7670d SHA-256: b2b6899060e332fe2f07d3da36920aebe4304c6572842374790cd854493a3443
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, with one primary URL being https://seumenha.ru/strik. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no direct instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=el+lazarillo+de+tormes+pdf+castellano+actual PDF link annotation
    • https://vematonejos.weebly.com/uploads/1/3/1/3/131383464/nevipidasus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_603593c24ebc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471682/normal_5fe9753bbaa5d.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/16229048550.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/frankenstein_mary_shelley_audiobook_free.pdfIn PDF document text
    • https://vizejuvevu.weebly.com/uploads/1/3/2/6/132681979/fosube.pdfIn PDF document text
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/wijatopilakibaz-pepugugupo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389820/normal_5ff85d58338f8.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/29281644704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_6019d9ccd3340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_60201518c245f.pdfIn PDF document text
    • https://ranutejojem.weebly.com/uploads/1/3/5/3/135314135/fupojitunir_guwajekaza_dodulifapaf.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/maxcare_extended_service_plan_phone_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387412/normal_60280a05e1d92.pdfIn PDF document text
    • https://jewezuwexokuj.weebly.com/uploads/1/3/4/7/134717424/lipulolosanugom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulitisagot.atwebpages.com/43396241632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da2adc8-8834-4c3d-9776-983d4f327cb1/meneren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129ef32b-172f-4a6d-8191-ecf05e88e662/dd_online_tabletop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71d9323e-51c7-4345-a747-120d60f74897/rurarewozubavumotipap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06704fd3-2650-4c39-bd45-187d1b947b47/enter_your_product_key_microsoft_excel_2013_without.pdfIn PDF document text
    • http://newemepakirid.myartsonline.com/weroli.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_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 5308 bytes
SHA-256: b9fcaad2c58882337333db199987afda560400f6967cb4379f3de6816d18c820
font_01_sfnt_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 12576 bytes
SHA-256: 6e683ff0c1ddb39893c3a3c9b68d440087806bd27e175b690ce2fffc939ec8e2

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