Malicious PDF — malware analysis report

Static analysis result for SHA-256 6947155b86d348b0…

MALICIOUS

PDF

73.2 KB Created: 2021-04-03 19:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 283659cba645385f31c2af7cc3d6655f SHA-1: ea26c1d028e024de365e316ec30773dce5e09bdc SHA-256: 6947155b86d348b066f7150fa98fb519c877402141705b5a287b3e32972211fb
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL observed is https://maypoin.ru/award?keyword=ansi+c+book+by+balaguruswamy+pdf, which is likely part of a scheme to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://maypoin.ru/award?keyword=ansi+c+book+by+balaguruswamy+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5ff03f44c717c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_60687d51e8b8d.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/fhijbOZ/moto_creator_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_60583557e046e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454807/normal_5fc734be7c25a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_601b503004a2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_602dfeb81e833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_6010891a98f9f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/windows_server_2012_r2_datacenter_avma_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/algebra_1_homework_practice_workbook_glencoe_mcgraw_hill.pdfIn PDF document text
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_1e8a7ea7093d4e038c39c3a41aa85201.pdf?index=trueIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_527008aa56684c71b96cfe2c4a08f6db.pdf?index=trueIn PDF document text
    • https://b09d99c6-da67-4e55-b5b3-baceba093817.filesusr.com/ugd/a69c6c_c7f72144a3e04882962f2d935dc3bcf9.pdf?index=trueIn PDF document text
    • https://765a5d72-5774-4a4d-a421-5c90307110ba.filesusr.com/ugd/f2a868_408afb4112f04e7d98d75638286e0823.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_7666a4a89e9c4abcbd1aed0a9b75e4d5.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_08c607ca36384e29a3c6d874ca516163.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_f61cdb008be94d649644d392d0c7a470.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_1b7db148dda44fcd8c38c746f0f42f84.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_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 5864 bytes
SHA-256: 935fc22c0e3927555d984408e8571c580095eab047a66dc242727f68656baab3
font_01_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 10796 bytes
SHA-256: 1c694b84b6d50046abaff80df09ac48d0b877a2ed7c54d2e2243fd18f5d3a47c