Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6f4e766c15c286…

MALICIOUS

PDF

78.5 KB Created: 2021-03-08 20:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab4b377a22fbf2af0610519fa0a00b63 SHA-1: ac790c1627a0f73c013fbe99ae926c5d38af86b7 SHA-256: cf6f4e766c15c28677f2bb07073669d67401a54d46d2dc0bc871de6e4cc031e9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URLs, such as 'nipisod.ru' and 'tegor.xyz', are likely used to redirect users to malicious content or download further payloads.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=l%2527+urbanisme+utopies+et+r%25C3%25A9alit%25C3%25A9s+pdf
    • http://tegor.xyz/damifiwuvajenlnyl.pdf
    • http://cosmosqrab.online/zobofittm3f.pdf
    • https://cdn.sqhk.co/zijigemeworu/Ihdhejg/lurodezij.pdf
    • https://cdn.sqhk.co/dovawowo/lWnQJgf/best_skateboard_decks_for_beginners.pdf
    • http://vnds-super.space/zombie_real_estate_agents9cnog.pdf
    • https://cdn.sqhk.co/daborofus/hheagcZ/lexakij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuwosil/advanced_crafting_guide_ff14.pdf
    • https://s3.amazonaws.com/sefepugolupalax/what_does_a_management_consultant_do.pdf
    • https://s3.amazonaws.com/pekatikisuruki/96140913531.pdf
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_34439d9b9d6d47f1a39633f3bd82236d.pdf?index=true
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_6e8531fb155e4e1894197a670b3528ce.pdf?index=true
    • https://s3.amazonaws.com/senodiw/baking_sheet_and_parchment_paper_difference.pdf
    • https://s3.amazonaws.com/mosezavor/webuzulevedowe.pdf
    • https://s3.amazonaws.com/pezofut/87951848934.pdf
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_7f2fb4ca07f640f8a3c9a032dca25753.pdf?index=true
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_aca98251ed7549d9b88406606720b50b.pdf?index=true
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_39bed6ea9f2c4e0ea4309144e09843e1.pdf?index=true
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_46c9a3aeebd74256a5ed052ecda5a195.pdf?index=true
    • 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_off0000f21b.bin
d94e07ef0c0a89072effb5d8335e8e4f491324b47960c82dd2c720e099b6fb51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 5444 bytes
font_01_sfnt_off00010441.bin
b1e3727df247366ea1f1406161df2914380a288815f289b5b611eb087bc48925		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 12360 bytes

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