Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45a0f4ec8178155…

MALICIOUS

PDF

120.2 KB Created: 2021-03-22 11:08:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 352ab59833e4944cbcce77c718731c33 SHA-1: 8ad97c1f6fa1dbee6acf70326196a3fe65755c14 SHA-256: a45a0f4ec81781556e8242219674dd6fa4c41c7c009af83c14e38cb2bb8a5b6e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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-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://botokaw.ru/strik?utm_term=how+to+program+minitor+v
    • http://hotel-engels.ru/yeniliki_retim_materyalleri_rnek5sln6.pdf
    • http://dezimazokuxulil.mygamesonline.org/zagg_keyboard_some_letters_not_working.pdf
    • https://topigofifudonif.weebly.com/uploads/1/3/5/3/135304546/xorigeri_pifusonaninile_rezetoxexoku.pdf
    • https://bivilasafufi.weebly.com/uploads/1/3/4/6/134689398/nezul-pegunuxi-buxumaz.pdf
    • http://nitafibejuze.mygamesonline.org/business_analytics_ms_in_canada.pdf
    • http://istlan.space/panaburixan9yvc.pdf
    • http://tb-films.ru/podenm8ult.pdf
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/5008274.pdf
    • http://subejewumo.scienceontheweb.net/calendario_laboral_2020_catalunya_para_imprimir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_ebd5ecf2be694f85a2dd1fd30cf1216e.pdf?index=true
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_981481ac1f75441fa9f537019afbb84e.pdf?index=true
    • https://4d3f6715-1114-433d-a4b7-45a5e22e3858.filesusr.com/ugd/ce86b4_8fbad127358543688e06dcc4f850e9a1.pdf?index=true
    • https://s3.amazonaws.com/fidefofudi/41199039875.pdf
    • https://s3.amazonaws.com/salade/filmywap_bollywood_movies.pdf
    • https://e4c06157-4c4c-4c30-848d-1ce07482e123.filesusr.com/ugd/99e070_109da2915bbc4d38890bde48cda5e1f4.pdf?index=true
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_89233b531c1b451f952e8c0a172ad68b.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_off000199cf.bin
f30dcae7f05b50badded7c8de4425f01df8dae501f8f18b02ca140e9aa96755e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x199CF 5040 bytes
font_01_sfnt_off0001aafb.bin
8686dc8432ffcf031c40da16fa5a2f36151f8bd92fa45c0fa93d26146f4a5a86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAFB 12448 bytes

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