Malicious PDF — malware analysis report

Static analysis result for SHA-256 561401423f8b532e…

MALICIOUS

PDF

99.8 KB Created: 2021-04-14 13:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6480727d347c781ce6c2957b11de807e SHA-1: 2aa180783da04f751a85f0141ae74d6f2de5d3d9 SHA-256: 561401423f8b532ec82238e542250ee07dc5c868c1959292ba21651914507a09
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=dirt+devil+power+max+bagless+upright+vacuum+ud70161+belt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414487/normal_602eb87430b85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_603e46307ea44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408596/normal_60231b6821368.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/mhe2Ihh/disney_premier_access_cost.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/wozig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_605be16569794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_601b0bfeb3b73.pdfIn PDF document text
    • https://cdn.sqhk.co/wisewuguv/hfUgjij/70231794686.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/fhiSZxz/lodowikonasujurebaxiv.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/rbCgfie/mirror_salon_pepperell.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/facad58b-a7a7-453e-a728-b55fcb189744/42181748214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/294a48fc-edf0-41dd-9c71-4e4fd74b61b1/jefifefojav.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/ffxiv_innocence_guide_normal.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/67728319377.pdfIn PDF document text
    • http://sogoxutagejuno.atwebpages.com/dirt_devil_vacuum_cleaner_bags_type_u.pdfIn PDF document text
    • http://lurebilowate.rf.gd/rojolivaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26ea5748-a8f3-497e-87b5-760fa1ba2c53/89739624882.pdfIn PDF document text
    • http://xogobitigo.rf.gd/faxexagijakuguloguvozu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 6052 bytes
SHA-256: 038c97d5247109156da708f60e29249d676f4618d2d1cf4da40b1322610533fd
font_01_sfnt_off000146f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F5 13552 bytes
SHA-256: c150baa69c85aea275431cba13053c5f3d24f467b066a31b293c7065585d2dce
font_02_sfnt_off00017368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17368 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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