Malicious PDF — malware analysis report

Static analysis result for SHA-256 a417f844a4286b98…

MALICIOUS

PDF

73.6 KB Created: 2021-04-04 21:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: db2c935ffc5137624dabd5abacb396f5 SHA-1: 553595a6f448c4d3b7dc0dca920ca59409a9315f SHA-256: a417f844a4286b985bf0a663e0137e809213f8db63bb16e0f6ce6bd53e9e543f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=capability+maturity+model+ppt+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445869/normal_5fcba4acd77d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406455/normal_5fd80964813da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_6010e14c995e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_603561a0d1802.pdfIn PDF document text
    • http://gloslides.com/splinter_cell_chaos_theory_coop_steam2rlim.pdfIn PDF document text
    • http://eslivdrug.space/how_to_calculate_p_value_for_two_tailed_z_testoloeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_600c9c184de2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424689/normal_5ff690ae8036d.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/anatomy_and_physiology_1_final_exam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403262/normal_6018b7205f6f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470024/normal_605eeb666e861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_6033fbeedc152.pdfIn PDF document text
    • http://nugowimabu.mywebcommunity.org/velemujusapike.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/wekuwesaletovawokovap.pdfIn PDF document text
    • http://suruliloxapesas.myartsonline.com/sudefapirorugagasefevu.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/sesoz.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/44615028900.pdfIn PDF document text
    • http://gafijid.atwebpages.com/html5_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/kick_the_buddy_full_game.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_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 5072 bytes
SHA-256: edb48cf86722943601b419c5006022adecc66d26a888936ddab082f6cf5d427c
font_01_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 10880 bytes
SHA-256: a8135e7fffcc53990e5b185f0750f59b8fd3e5eb7637c1f7b7c7720f4dec4b89

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