Malicious PDF — malware analysis report

Static analysis result for SHA-256 847fcc2703f339e6…

MALICIOUS

PDF

79.7 KB Created: 2021-04-18 20:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9c11ffdaf525d7f1d3c28d47b2cd67b7 SHA-1: d9a49999382329619914205107d34fd4d9017786 SHA-256: 847fcc2703f339e6f86b8fce87b6af259a80857d345d0bef3790cec26b4deba9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'seumenha.ru' and another to 'parewizukesez.22web.org', suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a social engineering attack.

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://seumenha.ru/strik?utm_term=nikon+d3300+costco+bundle PDF link annotation
    • http://parewizukesez.22web.org/tomogoduzokijop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488100/normal_5fffb47ad882f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_6023d6c2a6ce2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501054/normal_5fcbaafe254d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483610/normal_601e655a166cb.pdfIn PDF document text
    • http://nizuxep.iblogger.org/saloguvazizerekuwenubaxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450260/normal_5fc5f7d5385c1.pdfIn PDF document text
    • http://xewixejixukumes.22web.org/50926903712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420903/normal_5fdd3a85ac760.pdfIn PDF document text
    • http://sarelalitodidi.66ghz.com/powerflex_4m_fault_codes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/975c4b9f-b89c-4a96-a9f4-a674ac1448d7/80621710975.pdfIn PDF document text
    • http://zunedolu.rf.gd/juxewudafovuke.pdfIn PDF document text
    • http://bagusubeleduva.rf.gd/namimokuzopetafaz.pdfIn PDF document text
    • http://neguxonef.rf.gd/clostridial_disease_in_cattle.pdfIn PDF document text
    • http://bedimulepov.epizy.com/what_is_the_best_small_sewing_machine.pdfIn PDF document text
    • http://rubedirixadul.epizy.com/excelsior_springs_hospital_number_of_beds.pdfIn PDF document text
    • http://putudodizisag.epizy.com/yamaha_mg124cx_mixer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67577659-1b24-4142-8796-05a471251b84/dopozogabi.pdfIn PDF document text
    • http://dulanorelowekat.epizy.com/kyneton_cup_form_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7876e8-dece-4275-8819-876c15c43a22/how_to_put_baby_in_ergo_360_on_back.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e68041d2-0b22-4dbe-b39a-0c84bd326868/is_the_third_maze_runner_on_netflix.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_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 5108 bytes
SHA-256: 0489b273ae059e8138331f802487814d987bb8d227376bb5bc3fb33109a37f18
font_01_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 12004 bytes
SHA-256: e8ca3e831ab8e59f2d23cc2ea8f26b628dcc80ed5d4e8c6174da0765cb225abd

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