Malicious PDF — malware analysis report

Static analysis result for SHA-256 76320aaff4b8c08a…

MALICIOUS

PDF

77.8 KB Created: 2021-03-31 05:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d104ea031ca2b0b3aee820c123dd3439 SHA-1: 29217816c0b06669df233997ac7b317ed0884a51 SHA-256: 76320aaff4b8c08a4359a8b8f935d7617d9c621efe4073e556e0e4389c4cd18d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated a high probability of maliciousness. It contains a large number of external links, suggesting a link farm or SEO abuse tactic to direct users to malicious sites like lozipotod.ru. The presence of embedded PDF streams and the authoring application 'wkhtmltopdf' suggest it may be used to host malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://lozipotod.ru/strik?utm_term=texas+instruments+84+plus+ce-t+%2528ti+84+plus+ce-t%2529 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4527859/normal_600c8af265256.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448743/normal_5fec9c69b675a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486051/normal_5ff7860b968dc.pdfIn PDF document text
    • http://iminn.ru/how_much_horsepower_jeep_srt8tcfx1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_5fd5f078d0ff2.pdfIn PDF document text
    • http://legendbilisim.com/bohemian_rhapsody_tabscu2ik.pdfIn PDF document text
    • http://testrun.ru/sokopasuzedibavoze63ypk.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/3b37b764-b32e-4c99-a5e1-000daac5e568/online_mechanical_engineering_degree_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38668755-0ca2-4fa2-baf1-964598784dbf/tofugefiga.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/27604434542.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/44589667906.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/chhattisgarh_map_blank.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/what_is_aircraft_maintenance_engineering_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a7db0b0-809d-4f04-b8e4-f3abffdfb20f/42593604219.pdfIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_86736b43ede247cf91f5179f6024c10c.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_3b0983c431124d8caf42ac78a5899595.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e30ad0-5b1f-4b4c-b8e3-7f4f8707a0c9/what_is_meant_by_the_term_urban_areas.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/symbolic_interactionism_criticism.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/chesapeake_beach_fishing_report.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_24f545a85cf74e02989143c06ace7617.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulujono/who_invented_cheese_cheetos.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_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 5564 bytes
SHA-256: 4f24867722c67587f1792ed95c0a8916b96dcecb4cf66e56c4d403e47e5ed773
font_01_sfnt_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 10872 bytes
SHA-256: 2f8f18fa640c22db990b1321ed28a6f40b2e7665016219705b1482f4c4fe5b8b

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