Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75f74a3ac95f229…

MALICIOUS

PDF

76.7 KB Created: 2021-03-24 05:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3cbacac2cb27b36645656f0ec9b00d6 SHA-1: 73eaa6fe70930a0096d2f464723fe8e907b4576b SHA-256: b75f74a3ac95f229322a108b3bde5070f25dcd69bbe613a8d34d88ae6f0e3d99
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to suspicious domains and are likely part of a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

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://mezovuduw.ru/strik?utm_term=forgotten+realms+gnome+names
    • http://tezibif.mygamesonline.org/2380259937.pdf
    • http://kutejovanog.getenjoyment.net/20586786595.pdf
    • https://cdn.sqhk.co/wirumedaba/Ijhhix7/tuvasizolezirafugu.pdf
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/lulojumesopalo.pdf
    • https://cdn.sqhk.co/dofexoxev/frghqia/dedopanadep.pdf
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/salirovaxoko.pdf
    • https://cdn.sqhk.co/zezoxomop/BkjghjH/best_dogfight_games_pc.pdf
    • http://nujijaj.getenjoyment.net/hobby_electronics_projects.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eb197b41-b380-41e3-8e34-be18c082d99a/why_does_heat_burn_skin.pdf
    • https://uploads.strikinglycdn.com/files/0bdc23f6-b249-4eb4-8616-a7a3e4b1f606/kenmore_microwave_over_the_range_parts.pdf
    • https://uploads.strikinglycdn.com/files/9706d85c-9df2-475a-aa40-1375b396047c/how_to_help_auditory_processing_disorder.pdf
    • https://uploads.strikinglycdn.com/files/fe7f5917-b429-4569-baa1-a05b842036f0/cant_open_sound_in_system_preferences_mac.pdf
    • https://uploads.strikinglycdn.com/files/20f4f367-7ff1-4ed0-b665-5d1136f07517/how_to_use_record_player_instructions.pdf
    • https://f5ab370f-1445-465c-ae0a-adb246d340ff.filesusr.com/ugd/2d95ce_754f7d10608e4c9b96f829c75e87a087.pdf?index=true
    • https://uploads.strikinglycdn.com/files/51c0ab24-8eee-4545-baa9-41da6f8e6bed/motapivazamubopofi.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_off0000ef00.bin
5bb6e3dae7f764b563c24e157147ef7e568e5c7f3d1d402915dd99c559264ab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 4960 bytes
font_01_sfnt_off0000ffd0.bin
9c9e400f577cbddaeca63592d7ab8c52aab4ac41f559ceb30778a8deabc8865f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 11096 bytes

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