Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6ee8c8f2056acc…

MALICIOUS

PDF

72.0 KB Created: 2021-03-08 09:47:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 96ee847a0860c2cef3b2aaa047d97a9e SHA-1: 11fe5ab5eb473885a21e5871a568154e0335995f SHA-256: 3c6ee8c8f2056acc703f75559bae76e0bc2ee17dd498ddbb36dcdf307be03ad8
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with a high ML score and ClamAV detection indicating malicious intent. The document contains numerous external links, including one to 'xajibur.ru', suggesting it is designed to redirect users to potentially harmful websites. The presence of a link farm on disposable hosting further supports a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/strik?utm_term=air+oxygen+ratio PDF link annotation
    • https://vipekisurular.weebly.com/uploads/1/3/1/4/131453387/3481978.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/disney_fake_book_2nd_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/ieP3gjb/nuwite.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/8522912180.pdfIn PDF document text
    • https://cdn.sqhk.co/zinazejoras/hxBsiKA/mexitavodesanof.pdfIn PDF document text
    • https://cdn.sqhk.co/kovajivika/30asggg/89531053848.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/32215436161.pdfIn PDF document text
    • https://sewizafisebe.weebly.com/uploads/1/3/1/4/131437566/4c74b01b5.pdfIn PDF document text
    • https://cdn.sqhk.co/votexeruwiti/zDjahiK/age_of_empires_strategy_tips.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_8dd68da8f7304739bac81f54da59d23d.pdf?index=trueIn PDF document text
    • http://daruzafor.epizy.com/best_turtle_beach_headset_xbox_one_s.pdfIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_cd12a8e2181d4887ac13118b9cca47c5.pdf?index=trueIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_5604dcc2487f46de94e79a8faa326f1e.pdf?index=trueIn PDF document text
    • http://sexesivakolek.rf.gd/free_bootstrap_templates_for_shopping_websites.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_f646e9bdc68c4259b1e3e1454fa3c9ae.pdf?index=trueIn PDF document text
    • http://lodibusalibazi.epizy.com/austin_texas_accident_reports.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_eb9490f3cdf5414d95f8fea0d5a0ab68.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_c26eca0459a84057ae1c2d8111e5a1e4.pdf?index=trueIn 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_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 4800 bytes
SHA-256: d1c411674673a6e02fca9170cec73efc825de993ec973fec63c648d049afcf12
font_01_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 10196 bytes
SHA-256: 403b7195d48d32a0f03c24980ec711f9ee35acfc7ebb0e459bc007d8560c04a7

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