Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0f6176fe284d30…

MALICIOUS

PDF

82.7 KB Created: 2021-04-02 07:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e70468c966e9eab5914b3115baa02b9d SHA-1: 0f68a7d3f62ddd720212c1c3d10399fe0757c18e SHA-256: aa0f6176fe284d30653e02a7df0ff63b1fa7ea87283ace6342b8780043188da0
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination and leverage disposable hosting. While no scripts were directly extracted, the presence of numerous external URIs and the ML classifier's high confidence score suggest malicious intent, likely to phish or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/aws?utm_term=2005+honda+accord+hybrid+maintenance+schedule
    • http://seedcraft.online/play_free_3d_bus_simulator_games_onlinexqwwc.pdf
    • https://cdn-cms.f-static.net/uploads/4449616/normal_5fd3cdcd7e505.pdf
    • http://mists.space/51682517417bosa8.pdf
    • http://kukufimivote.iblogger.org/tenra_bansho_zero.pdf
    • https://static.s123-cdn-static.com/uploads/4499633/normal_6001e38dda025.pdf
    • https://static.s123-cdn-static.com/uploads/4484835/normal_5ff8271fd6b2f.pdf
    • http://sozapemogoz.mygamesonline.org/49457761726.pdf
    • https://cdn-cms.f-static.net/uploads/4495251/normal_6027de1f83d21.pdf
    • http://pifadopagel.scienceontheweb.net/corporate_strategy_vs_business_strategy_vs_functional_strategy.pdf
    • http://rajenajodaf.iblogger.org/pokodavunuzof.pdf
    • http://ferabugajefelam.mypressonline.com/5219071785.pdf
    • http://kokofiru.22web.org/excel_spreadsheet_on_android_tablet.pdf
    • http://kofibilo.22web.org/achievement_oriented_leadership_definition.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/9eab505b-9dba-4627-8f22-ccf008255ac0/54541647745.pdf
    • http://retejepak.epizy.com/nisomezev.pdf
    • https://uploads.strikinglycdn.com/files/5c61abdf-a38e-4479-b014-98039e8b0361/ap_spanish_literature_practice_exam_2020.pdf
    • https://uploads.strikinglycdn.com/files/4d8a3755-2c4a-4206-b081-929003a1f9a6/how_to_install_paper_in_canon_p170-dh.pdf
    • https://uploads.strikinglycdn.com/files/d9768bf5-da12-4bc9-8570-6187f00f2357/vugisulewifivenokusu.pdf
    • http://tabikobi.epizy.com/rupuni.pdf
    • https://uploads.strikinglycdn.com/files/d075220c-f79f-424c-810e-3ee75ee8cd5b/how_to_rune_magic.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_off0000f6ce.bin
7e11e56242c77cf501482a4925b829a9444009e709813447a295feeb4c8585bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 5604 bytes
font_01_sfnt_off0001099d.bin
4fd959acfe3a780d8f1525e26dc0c10b2e30c4e55f212569abd2c656f59c696e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 10848 bytes
font_02_sfnt_off00012ebe.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 4324 bytes

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