Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6e88d7ead936be…

MALICIOUS

PDF

72.4 KB Created: 2021-02-26 13:00:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5587d9b8e93fcce5a674715049f0eaa4 SHA-1: 8da7b9b350f0bf089c6a59a722f6baa39850b7b3 SHA-256: ea6e88d7ead936be53860da59565713aa3136110ac19ea85228779863b8e8c38
66 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one prominent URL leading to a suspicious domain. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to redirect users. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic strongly suggest this document is designed to lead users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://lozipotod.ru/123?utm_term=shark+navigator+lift+away+dlx+accessories PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409819/normal_602dd4740b842.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/how_to_do_conditional_probability.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_601bd19e89c9c.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/pawenofemitor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387433/normal_603348f89c291.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485800/normal_6008affb14d66.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/rolegotolosewimudegu.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/mossberg_500_ag_pump_slide.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/taxezurekikuwokekomipevos.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/gctCUBZ/zokitujivabodibarazotomov.pdfIn PDF document text
    • http://physcoo.com/civil_war_timeline_worksheet_answersp16hi.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/ruxikelixadadokofovedones.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/50917852667.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://liroporuki.myartsonline.com/32910344693.pdfIn PDF document text
    • http://vumamuv.myartsonline.com/do_cows_stay_outside_at_night.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 5560 bytes
SHA-256: 08a3d80b0edb6ba1aa56e3418b9da927f8b9568999af833bcb7c15648a35c28b
font_01_sfnt_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 11196 bytes
SHA-256: 056c7521f7285ec10ccba5fcba99e630e3b6a2c575fb25b9f6663914c5971739
font_02_sfnt_off00010635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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