Malicious PDF — malware analysis report

Static analysis result for SHA-256 089602f667e92c39…

MALICIOUS

PDF

110.1 KB Created: 2021-03-04 19:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ddc62e7dbf2941c3bd10c27949da7f57 SHA-1: e6483493d54d6fd9acb9ae434e41fb3f985e47f6 SHA-256: 089602f667e92c39d393d3a97d0351c2a3f5e9664dea721f756db5c47e35cf3a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/123?utm_term=when+to+use+raw+pointers+over+smart+pointers PDF link annotation
    • https://cdn.sqhk.co/guwezasov/whdjdib/cat_meows_when_jumping_down.pdfIn PDF document text
    • https://xigologilajuveb.weebly.com/uploads/1/3/4/6/134672854/29113332.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/652910.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/aghRsH9/vuwaletotiletivemaxuwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418370/normal_5fc72e4342afa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460473/normal_5fcba187a85ef.pdfIn PDF document text
    • http://nukuxarigikuxez.iblogger.org/golilibigeneriru.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/gcUtihV/wimuketup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_6032a5357786f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_6018500f43e39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_60161988879ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421778/normal_600a49a0d768e.pdfIn PDF document text
    • https://lavovozanu.weebly.com/uploads/1/3/0/7/130739022/voxaguvujuropebud.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/igicheJ/judamirokab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466664/normal_60152e7e40f68.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/ec2c10f3-fd2e-4d3f-bf25-959bd4037aea/86970741889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8db0530c-3ffd-46e0-b2e9-a13f1b151146/ridotuno.pdfIn PDF document text
    • http://xizegamujepe.epizy.com/79648237832.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_off000174ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174EE 5192 bytes
SHA-256: a01fa71c0f63cb1617dabdd05679c1e3dbd62ef91fb91301e6f35b1c1bf8a2c8
font_01_sfnt_off0001868e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1868E 10544 bytes
SHA-256: 38586285b9571eda6bf813dcedb00ada7608441cf146f86b4ec5c7c06906416c

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