Malicious PDF — malware analysis report

Static analysis result for SHA-256 65dcef67a18da950…

MALICIOUS

PDF

89.4 KB Created: 2021-03-01 20:19:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 496cb615a55bcae5d7890c111cb1ea07 SHA-1: 308ba7f6e07fce4a50f6cdf60277411dce8a392f SHA-256: 65dcef67a18da95001396b68244578998d9294443a7d72db04eb7124b33b31e5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, flagged by the PDF_SEO_LINK_FARM heuristic. The primary URL, https://kuzutuzo.ru/wix?keyword=jam+transit+bluetooth+headphones+how+to+pair, suggests a potential lure for users interested in specific products. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=jam+transit+bluetooth+headphones+how+to+pair
    • https://static.s123-cdn-static.com/uploads/4381756/normal_5fe12dcfcdef4.pdf
    • https://static.s123-cdn-static.com/uploads/4505102/normal_5fe012e1d716d.pdf
    • https://cdn-cms.f-static.net/uploads/4375206/normal_5fd17132e01c7.pdf
    • https://cdn.sqhk.co/vizakifito/uqgjhbA/bearded_dragon_for_sale_near_me.pdf
    • https://cdn-cms.f-static.net/uploads/4394071/normal_5fe95501472d8.pdf
    • https://cdn.sqhk.co/tivanosox/jghfjdP/teachers_union_massachusetts.pdf
    • https://static.s123-cdn-static.com/uploads/4422918/normal_5feff4afb8ca6.pdf
    • https://cdn.sqhk.co/javeduner/flrbhbn/world_soccer_league_18_football_world_cup_2018.pdf
    • https://lewagezu.weebly.com/uploads/1/3/4/3/134369469/81df7ba0.pdf
    • https://static.s123-cdn-static.com/uploads/4408875/normal_5fcb584aa1950.pdf
    • https://cdn-cms.f-static.net/uploads/4425230/normal_60140b42d7897.pdf
    • https://static.s123-cdn-static.com/uploads/4497666/normal_5ffebc4270fb8.pdf
    • https://tufanemoxidubux.weebly.com/uploads/1/3/4/3/134315727/loxowonegoworuj.pdf
    • https://cdn-cms.f-static.net/uploads/4450250/normal_5fe86a185cfbf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wenobagupexekap/autocad_2007_version_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011456.bin
42963dd7273d71e53918b9d0fa3701db8d482d0b0b8421a6fcfb2636c6eb24e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11456 5300 bytes
font_01_sfnt_off00012625.bin
b7d04e9c9f973b19ddd658d69bbf06e517db606dc5360673259b33227af01faf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12625 10476 bytes
font_02_sfnt_off00014a0e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0E 4324 bytes

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