Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efbb70f85dbfdce…

MALICIOUS

PDF

81.0 KB Created: 2021-05-07 20:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4508020156c420fedcf57db889610d99 SHA-1: 3f03a12211b49b547bccaa22ee4c6dd698c68465 SHA-256: 3efbb70f85dbfdce1219de624d53e25e11ababad4da4e232298e310bf8d1a36b
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and it contains numerous external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of the PDF being used to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the presence of external links suggests an intent to lead the user away from the document to a resource controlled by the attacker, likely for phishing or further exploitation.

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://seumenha.ru/strik?utm_term=bulova+precisionist+battery+life PDF link annotation
    • http://mujubow.getenjoyment.net/archaeological_sources_of_delhi_sultanate.pdfIn PDF document text
    • http://larumutul.getenjoyment.net/48961704887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_601fafe67e3b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_606ad46be706d.pdfIn PDF document text
    • http://wavulefarunatev.iblogger.org/can_print_from_quickbooks_online_be_converted_to_desktop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5ff08099e3219.pdfIn PDF document text
    • http://sarupunojupud.sportsontheweb.net/71545323581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_606c4ab557958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5fdd929825ca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_60630fefcc4f9.pdfIn PDF document text
    • http://xesukifogenabe.iblogger.org/fuwuxuxetipirolorero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_5fd69b8a61ffa.pdfIn PDF document text
    • http://sijiwepi.mypressonline.com/jiduvipuxikakixefiw.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/vojutokekodasufetaw.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/vazibedog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412774/normal_6037559ba2c92.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/55ce8ee2-57ca-468c-b772-66b4cd852ebe/xilamedinezakedifazobo.pdfIn PDF document text
    • http://pixajofa.rf.gd/the_addams_family_musical_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38474960-2d0e-4279-946e-f95ec281db3c/libro_de_espaol_lecturas_primer_grado.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_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 5360 bytes
SHA-256: 8feb867854e3d48aa5335c6180dc4aebd2969527b0b821ad549efc666366f3d8
font_01_sfnt_off00010c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6D 12356 bytes
SHA-256: 413742ce0d7aef5f48691acf31fb0531aba68e33d988a93becac5a40f6bf10ef

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