Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d29039b832c2a82…

MALICIOUS

PDF

77.6 KB Created: 2021-01-08 20:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f9a609b1ac7bd92f8b0ad2e74a93085b SHA-1: cc3d502ad7b62d1f745b52f694193040158ed14a SHA-256: 6d29039b832c2a8238245b952255a45dce2291af808abd01cd7a82eb20fc91f2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting services or domains associated with link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure suggests the PDF is designed to redirect users to potentially malicious content.

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
  • 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://traffset.ru/123?utm_term=mla+encyclopedia+citation+bibliography PDF link annotation
    • https://fefaxositepimu.weebly.com/uploads/1/3/3/9/133986539/tujikakebanezo.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/1578510.pdfIn PDF document text
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/4289174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_5fb943c96c5fa.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/98e590ca.pdfIn PDF document text
    • https://gunesakozi.weebly.com/uploads/1/3/0/9/130968934/89916d1f1559.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/tibanepoxilibud/lulazixefirabizu.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/hubspot_partner_certification_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/37974193890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26cb8405-453e-4c1d-8a42-b62b95bc287f/vurilokijow.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 5404 bytes
SHA-256: c1f8eceea1bfc983e11388a8b7dd9aa19644b7c4621882d59a94c8a47e890c72
font_01_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 11272 bytes
SHA-256: a77afb413f4a40a7a8b3e3cf7f683eb013e50df45a753c458553c89d1dda9718
font_02_sfnt_off000112b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B5 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b

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