Malicious PDF — malware analysis report

Static analysis result for SHA-256 6227d3bba93b17fa…

MALICIOUS

PDF

77.3 KB Created: 2021-04-21 06:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4684b124a8d5a95d9e80b1992f4c9c20 SHA-1: a8de59b810d674af3a33e0ba3f5315f3a14a9fe8 SHA-256: 6227d3bba93b17fa3fe891ba328fd45f29460bc4b303900e69062b23c034703b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('nipisod.ru' and 'jirusulixozome.scienceontheweb.net') that are part of a link farm. The document body, though heavily obfuscated, suggests a lure related to 'descriptive text' and is generated by wkhtmltopdf, a tool often abused for malicious PDF creation. The presence of embedded URLs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=what+is+structure+of+descriptive+text PDF link annotation
    • http://jirusulixozome.scienceontheweb.net/artificial_intelligence_a_modern_approach_third_edition_solution_manual.pdfIn PDF document text
    • https://lubukapilibuvi.weebly.com/uploads/1/3/4/0/134095968/fipuva_rezidazogekapa_vulem.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/9159607.pdfIn PDF document text
    • http://vitodibiwanezej.mypressonline.com/sidubaxuvanoker.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/instant_pot_recipes_indian_butter_chicken.pdfIn PDF document text
    • http://ruszaimclub.ru/head_first_jquery_a_brain-friendly_guidennbwq.pdfIn PDF document text
    • http://itwow.info/sirumunejivomdpwpw.pdfIn PDF document text
    • http://pixelbarista.com/loctite_243_safety_data_sheet8phxj.pdfIn PDF document text
    • http://keto-menu.online/staples_paper_shredder_replacement_partsz3j2y.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/wasipijelazojiwopasiwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_4748d601580443acb417114e1d8f4d1c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d29fe7-3cab-40c6-9e3a-f41256514d97/miller_xmt_304_aluminum_tig_welding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69bd709d-0c29-41fe-be87-21ff3fd98c4e/2019_ford_mustang_gt350r_horsepower.pdfIn PDF document text
    • http://zaxuzut.atwebpages.com/branchless_banking.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_925bc1705b78469783589ba4b86cc647.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_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 5352 bytes
SHA-256: 5a50920af98a5ae135ebcac8a42b3f40202d68d22d887bea13f653ed4e6df333
font_01_sfnt_off000101a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 11292 bytes
SHA-256: 9de1830d8706e5bed105c53b2e9059e68aa876309cbd456a30d4835cbdac2783

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