Malicious PDF — malware analysis report

Static analysis result for SHA-256 51677e8213643c96…

MALICIOUS

PDF

75.4 KB Created: 2021-04-23 01:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 254cce37cac35c396adeacb825b1562b SHA-1: d510e9c2220e951072d70aaf78c869b3803a9f62 SHA-256: 51677e8213643c967eb845affe617d2a663e96f542f7c1785ad2245f1c568dc2
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics as a potential phishing or malicious link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'lock pick guns'.

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://mezovuduw.ru/strik?utm_term=do+lock+pick+guns+really+work PDF link annotation
    • http://surozofawowidom.scienceontheweb.net/kumepubagakojalilotov.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/xhhKdij/wilexejepopeter.pdfIn PDF document text
    • https://cdn.sqhk.co/sofetarunox/sigjcie/4665558923.pdfIn PDF document text
    • http://fijigud.22web.org/russian_grammar_book.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/BligLhf/78368483141.pdfIn PDF document text
    • http://sugalomiwuto.getenjoyment.net/pikoma.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/VgdBvji/2790571292.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af103ef-a1d1-45ee-8538-1e5cea020ceb/kupamuxaxigugutarusorod.pdfIn PDF document text
    • http://jaguzawa.rf.gd/temperate_deciduous_forest_biome.pdfIn PDF document text
    • http://sejanaxopuvogiw.epizy.com/osha_flammable_storage_cabinet_grounding_requirements.pdfIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_b14f3f1207664c0fa0c7f8832e254e85.pdf?index=trueIn PDF document text
    • http://dovudegumigisaw.rf.gd/extended_essay_reflection_guidelines.pdfIn PDF document text
    • http://wevikokuzufos.epizy.com/abhimaan_songs_mr_jatt.pdfIn PDF document text
    • http://pirigebosagome.rf.gd/cardiologia_nuclear.pdfIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_f6eee44a81ca43d59eeefaa81ffc1a3c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/261e28e5-a40b-4cc4-afa3-c1d339e844fa/xugez.pdfIn PDF document text
    • http://vodoxaxadax.rf.gd/p_g_online_reasoning_test_answers.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_0e0b1aec017e4f4d8d438cf5f8e5c187.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_aa343f99c3ec4252abd68b96c9e89c89.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_179d0e42ae6040f293aded45a4afd323.pdf?index=trueIn PDF document text
    • http://sukokovevaz.atwebpages.com/6297666671.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 5360 bytes
SHA-256: d99b6c53c848924f8bc2211f47d986e7dfbbd1f9c02ebf21079b68058b899aa9
font_01_sfnt_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 10716 bytes
SHA-256: 1bfa2e630caa947e31827a82eea48a943007f58a5d20d1e873a7695169c0170e

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