Malicious PDF — malware analysis report

Static analysis result for SHA-256 f642bd04a8e668ba…

MALICIOUS

PDF

85.2 KB Created: 2021-03-23 12:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e8abe80a44eae3ac579ceb30b44287e3 SHA-1: 110095bb0c88386678609f1f95f63ab09fa1fd80 SHA-256: f642bd04a8e668ba709aa8d2334ad36b15dbb38dd89600f464f283ef02847872
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://nipisod.ru/strik?utm_term=basic+fantasy+rpg+solo PDF link annotation
    • https://cdn.sqhk.co/tokofape/ihEyPaF/five_a_side_football_2021.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/YjcUujc/gosakigamometagusafudav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493200/normal_5fdc3f7676b40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4859821/normal_604aaa36b2e93.pdfIn PDF document text
    • https://cdn.sqhk.co/bataseset/Ao6agdb/54408053499.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/6KihIgg/82115308470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410416/normal_601efda4b77a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://movixup.epizy.com/19061306896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45363c44-ec6e-40aa-b94c-c70563cc600f/varobagurarezozur.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/graphic_designers_resume_templates.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/normas_apa_bibliografia_de_libros_ejemplos.pdfIn PDF document text
    • http://juvusowupu.onlinewebshop.net/57831382856.pdfIn PDF document text
    • http://budezeja.rf.gd/convert_to_word_document_office_365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a473e944-9d23-42fb-9339-bc43b40b9897/conflict_resolution_skills_for_couples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3237eab8-cf74-4748-93ea-db9d3f9499c2/dukefo.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/3140234466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/507d21a0-5c86-4c0d-b215-77506980e560/nixon_unit_40_watch_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/dujonifa.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/swot_template_for_mac_pages.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 5004 bytes
SHA-256: 8d52dd7a59f17f89cc2dfabad87b5be1c1f25e642a77c3f7b4a8af24e1193754
font_01_sfnt_off00011357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 11268 bytes
SHA-256: b0315ff6f2f8429b94d3ebb60b7245b0006db0d97f5ee5e55328a62b84be47de
font_02_sfnt_off000139b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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