Malicious PDF — malware analysis report

Static analysis result for SHA-256 d100fb0cb53fc8d8…

MALICIOUS

PDF

78.4 KB Created: 2021-04-14 20:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0279b6ada2c4fdc57e10e82a83274336 SHA-1: 971d68ffdcb63724d6e3fd9ed0fb96921c8b7338 SHA-256: d100fb0cb53fc8d871f25eeb995eabb349c31171fb1f6018cfcc56134f44b3f9
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to drive traffic. It also includes an external URI pointing to 'seumenha.ru', which is likely malicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=hp+envy+incompatible+cartridge+error
    • https://static.s123-cdn-static.com/uploads/4484805/normal_5fc5c8f29606e.pdf
    • https://cdn-cms.f-static.net/uploads/4389582/normal_6058f4f978ef6.pdf
    • http://inglassrus.ru/how_to_build_a_good_house_in_minecraft_survival_easydn0kd.pdf
    • http://ig-objectionform.com/sinaxarafujadovj0ak.pdf
    • https://cdn-cms.f-static.net/uploads/4379982/normal_5fd13709b1148.pdf
    • https://static.s123-cdn-static.com/uploads/4444626/normal_5fd0477da6f30.pdf
    • http://mists.space/pefubulodeguboxeldx1ny.pdf
    • https://static.s123-cdn-static.com/uploads/4484358/normal_5fdf0fa4a0197.pdf
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5fc667e906c38.pdf
    • http://lifeshop.pro/the_best_christmas_pageant_ever_freexrqjj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_ada45bafbea9426abcf2d38673a47932.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ed422e15-bdb0-4e56-9e12-7817960031f8/characteristics_of_a_good_teacher_essay.pdf
    • https://uploads.strikinglycdn.com/files/3f8d71c1-a4c1-4d69-a6c7-8b411561e51b/14003849721.pdf
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_121815c71e5d4ede83d6d704d88704ab.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9b8394a8-cd89-458a-b8dc-56a42a4ddda8/62655698102.pdf
    • https://uploads.strikinglycdn.com/files/4ef4107e-c690-466b-bd6b-027db8f0781c/zolijalumumugakefubude.pdf
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_21921fd979324659a4bf46b3fb35f48f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fb6b3d84-7d57-4cbe-8139-ef0755927656/how_to_use_the_bissell_proheat_essential.pdf
    • https://uploads.strikinglycdn.com/files/899f3880-573b-4347-9c7b-3ca44534a86a/how_to_do_apa_references_in_google_docs.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d0.bin
d4161d0bf73b31d8a17c3fd71e27acf845a81d24c712a5655f9c595cfce07dd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 5476 bytes
font_01_sfnt_off00010563.bin
822d3f5c73f53745f48b24e9fdc4b1bab4d5be35d334d069aad23a09a03630c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 11020 bytes

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