Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9182ddd3520309…

MALICIOUS

PDF

77.0 KB Created: 2021-03-04 11:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 043aedb2384a9deccd85f1c18d99d567 SHA-1: e65de20d0529fc8f4d008a006649f6f432fc4870 SHA-256: af9182ddd35203099326c89f81c8a696c2ca6d95173588a29d8dd946ada71702
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The primary URL, dugedepap.ru, appears to be part of a link farm hosted on disposable infrastructure. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://dugedepap.ru/award?keyword=what+underglow+is+illegal+in+california PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421050/normal_5fd790ec57e9f.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/dajole-kimiluf-nosewugowititu-pumizadi.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/xukiwokes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fda5db4a4fed.pdfIn PDF document text
    • http://bilkaita.space/tivatidizicl2tg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480884/normal_5fff69eb2e5a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_60404d90bfcac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501804/normal_600fa8fbc458b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_600ecb6217f3e.pdfIn PDF document text
    • https://nidukonijeso.weebly.com/uploads/1/3/1/3/131381088/zejiwupadisomab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kaluzepo.rf.gd/krystal_clear_saltwater_system_for_7000_gallon._above_ground_swimming_pool.pdfIn PDF document text
    • http://marojinoz.rf.gd/zabewofab.pdfIn PDF document text
    • http://banezisiwirasu.rf.gd/how_to_clean_drip_tray_at_back_of_fridge.pdfIn PDF document text
    • http://temidegizesoweg.rf.gd/72650326155.pdfIn PDF document text
    • http://deravamosu.rf.gd/bangla_comedy_movie_free.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_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 5388 bytes
SHA-256: b697a9ac144ab1f9f39ebcd7e6d093fec48a748eb96d96d230fcd15da45e21b1
font_01_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 10796 bytes
SHA-256: eeed38cdbfe74217ce020973d9b3478f70f4bfee298d38e8e1dafb908f4df497

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