Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9b89665bed18af…

MALICIOUS

PDF

77.7 KB Created: 2021-03-14 08:19:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 72cd1a85076059b261ea4df9b7baddbf SHA-1: dd8bab3641727ad1e562905ebe98d012baad1bae SHA-256: bf9b89665bed18afdd500cba6c19c36ae07dc0629e2c4328d9462a97b6405732
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The file contains a large number of embedded links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://dafemum.ru/wb?keyword=where%20to%20find%20the%20seven%20deadly%20sins%20in%20the%20bible In PDF document text
    • https://cdn.sqhk.co/kufomopinu/iijhgke/lokodeduxiwuwole.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/GjffiaH/kekuju.pdfIn PDF document text
    • https://cdn.sqhk.co/totuzilexif/hphaCx5/21123018316.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/iiJDeie/find_my_iphone_by_phone_number_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pagupuxu/hxDVExx/46115268504.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/eDhezgf/50704201306.pdfIn PDF document text
    • https://kevifuzokidoku.weebly.com/uploads/1/3/5/3/135310888/4023747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386605/normal_600a3e20c1a8d.pdfIn PDF document text
    • https://lalevajapogos.weebly.com/uploads/1/3/0/8/130874146/buminuvugam.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/fundamentos_tecnicos_del_futbol_resumen_corto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_60295253270bb.pdfIn PDF document text
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/rimalapuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_600c23489ce8d.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/dOlFlo0/droid_optimizer_pro_apk_cracked.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/cisco_networking_all-in-one_for_dummies.pdfIn PDF document text
    • https://cdn.sqhk.co/sopirisaset/e5mrhhm/pets_domain_rabbit_hutch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac6a5e95-3fab-4d4b-a7e7-0ef4c71e5929.filesusr.com/ugd/32c278_af53b5e302eb42b690e4583215055888.pdf?index=trueIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_f81923c25a0940e99e8a57960f0cc59c.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_e96db4c064344d049c70d807130d6675.pdf?index=trueIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_edcde5b30a124a26bed422d46598a9d7.pdf?index=trueIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_86bd135d6deb4993b03c41c4df422f23.pdf?index=trueIn PDF document text
    • http://zewadomi.myartsonline.com/alucinaciones_definicion.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_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 5312 bytes
SHA-256: 4dfed0b1647ad98c8628ffbb7a4ee2c5ed48d3822f08e240f20c802410fdb91e
font_01_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 11296 bytes
SHA-256: ee62da958a801b9b4e7e5a6f43b03b54f5f047a6964a47442561f9891b8d83d9

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