Malicious PDF — malware analysis report

Static analysis result for SHA-256 a012486d504ed0c9…

MALICIOUS

PDF

79.3 KB Created: 2021-01-07 20:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 533d9868e2148384ceeef6cabbaf3eb4 SHA-1: d36ac074c5b8a480f5a4ad86c7ebd09495e19259 SHA-256: a012486d504ed0c9451c6a1dc45a28ba98772aa66bb2b1234f937bf4e478c484
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to 'traffine.ru' and including 'business+case+document+template' in the query parameters, suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting a malicious intent. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/aws?utm_term=business+case+document+template
    • https://cdn-cms.f-static.net/uploads/4419236/normal_5fd9639db301d.pdf
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/xurejetexu.pdf
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/xitojug.pdf
    • https://cdn.sqhk.co/benibavagoge/dghgLt7/78002958502.pdf
    • https://lagonola.weebly.com/uploads/1/3/4/8/134851586/tadedovukogix.pdf
    • https://jiwamotezonadiw.weebly.com/uploads/1/3/4/3/134325797/9d30205.pdf
    • https://cdn-cms.f-static.net/uploads/4406473/normal_5f949a7a98a4a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/remeranexe/universal_male_suffrage.pdf
    • https://s3.amazonaws.com/befarekogol/mapping_worksheets_for_grade_2.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/18971509447.pdf
    • https://s3.amazonaws.com/jubiferekaka/36817351475.pdf
    • https://s3.amazonaws.com/xakajoziwibi/distillation_column_design_calculation_free.pdf
    • https://uploads.strikinglycdn.com/files/618a9e7b-1a89-477c-b0c4-c620c8bf9806/33005856252.pdf
    • https://s3.amazonaws.com/zatazewoz/black_sabbath_paranoid_full_album_free.pdf
    • https://uploads.strikinglycdn.com/files/a8771ca6-7d0d-46bd-a00a-0a37d8cc9614/lijonigafu.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_off0000ed4f.bin
723389d32e2288229e683a437d4cf3c67e8f0faa43de5b41d9918b57dad619e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 5056 bytes
font_01_sfnt_off0000fe5e.bin
d0cec2a27b2d87bf11f78682fb87f58609fce93339fc125c4de6a9fbc1251d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 10640 bytes
font_02_sfnt_off0001228f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 4324 bytes

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