Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6fc02903d97893…

MALICIOUS

PDF

78.7 KB Created: 2021-04-24 07:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 74d5071b6eec960aadfbe78f5c392fb0 SHA-1: 665733542019e854854e1d90cc494a59ba7902d4 SHA-256: 4f6fc02903d9789346ba562695c338b13792cfa9815b8f4bb4c3b6cdd3cfc41c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with one prominent URL pointing to a site related to 'how to relight a york furnace', suggesting a lure to trick users. The PDF also functions as a link farm, distributing links across multiple disposable domains and subdomains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=how+to+relight+a+york+furnace PDF link annotation
    • https://cdn.sqhk.co/xiponamoribo/jbqIgeI/38477092650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_6010fde6d8613.pdfIn PDF document text
    • https://cdn.sqhk.co/bodorosuzuta/gj1uhig/watorojilasifemalafet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389809/normal_605db9feea9ac.pdfIn PDF document text
    • https://cdn.sqhk.co/xumelesep/ifEL6jX/dc_superheroes_coloring_pages.pdfIn PDF document text
    • http://berozava.iblogger.org/penujazitagorowono.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/vx7XHjc/givitojevulupivone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471081/normal_606bc5dbc9568.pdfIn PDF document text
    • http://dewobazul.22web.org/manual_chevrolet_tahoe_2007_en_espaol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_5fdacaedd4724.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378378/normal_6005fa0f4c8b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5fe882ad97010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500208/normal_600cb2774c911.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/iiUmjhK/81840374689.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369930/normal_5ff31f1291267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375073/normal_6050c90e45c75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nusilelopalal.epizy.com/dell_emc_sc5020_installation_guide.pdfIn PDF document text
    • http://nagikesedogoru.rf.gd/79905878664.pdfIn PDF document text
    • http://ridejisedogik.rf.gd/caracteristicas_psicologicas_del_adulto_mayor.pdfIn PDF document text
    • http://rozejogore.rf.gd/mirab.pdfIn PDF document text
    • http://jomovexujufadi.epizy.com/jquery_ajax_post_data_form_serialize.pdfIn PDF document text
    • http://narodano.epizy.com/81978810143.pdfIn PDF document text
    • http://sadamalaju.epizy.com/bengali_story_books_download_free.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_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 5184 bytes
SHA-256: c91350d9da9768d6130ac95323bfbf52da0551f02d3fcad1058123ba0fa01596
font_01_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 11484 bytes
SHA-256: 6d1725aa34cfde41876e38ad5eb8f007f6c3c17a052c90514e5128c04c3a7c4e

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