Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b113b856235641…

MALICIOUS

PDF

73.6 KB Created: 2021-03-18 11:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c685c2514a2d91b8682215dbc6f2878 SHA-1: b3e7d0f27b531dca14d6a44a98c86485ab5c82c7 SHA-256: a4b113b856235641cf64ab63fba43ecc537c9af76189a3bc2cad3ca2ead36b46
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable or unknown-reputation domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=bose+cinemate+15+instruction+manual
    • http://lelekelosutov.getenjoyment.net/apartheid_laws.pdf
    • https://static.s123-cdn-static.com/uploads/4401989/normal_5fe1befa56c7f.pdf
    • https://pefibiwurabamiz.weebly.com/uploads/1/3/0/8/130874510/1210462.pdf
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/301659.pdf
    • https://static.s123-cdn-static.com/uploads/4493597/normal_5ffa933ac4f0c.pdf
    • https://cdn.sqhk.co/jidelugob/ujcibji/most_wanted_mod_apk_free_download.pdf
    • https://static.s123-cdn-static.com/uploads/4449793/normal_5ff3bef6e4201.pdf
    • https://cdn.sqhk.co/virurewev/cLjezjb/zipuneruf.pdf
    • http://suzamajotibe.mywebcommunity.org/69445544673.pdf
    • https://kogejuxo.weebly.com/uploads/1/3/1/6/131606118/dolegosu.pdf
    • https://cdn-cms.f-static.net/uploads/4385028/normal_601f1511f259d.pdf
    • https://cdn-cms.f-static.net/uploads/4466166/normal_604e23e7c68a5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/marimejerebo/how_to_write_an_observation_paper.pdf
    • https://s3.amazonaws.com/jevopemosod/62357867422.pdf
    • http://jezevenakos.myartsonline.com/rent_agreement_format_download.pdf
    • https://uploads.strikinglycdn.com/files/d60b6f3a-c7f6-43a4-8a46-c6cae5b13e53/dd_3.5_duskblade_handbook.pdf
    • http://voturugivorajop.onlinewebshop.net/modern_military_dictionary_english_arabic_arabic_english.pdf
    • https://s3.amazonaws.com/gifojuxaxeva/71139142226.pdf
    • https://uploads.strikinglycdn.com/files/c7c061af-db46-4599-9420-872e8424f3c1/lepali.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_off0000d95f.bin
4567f0574165c54dd74c6ca78ed818e8005d28b53214994075838d7eb500c0de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 5172 bytes
font_01_sfnt_off0000eadf.bin
b7eff3fbbc7c49fe5e0cc545dc17000fb85c0a24b0e6ad08f24ac2939ee3bb03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 2156 bytes
font_02_sfnt_off0000f449.bin
044df462c0e14ab62e159b63d8ec92030a024d58d57b8b8d2f8504308ffd9849		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 10728 bytes

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