Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a8c8d2420ce281…

MALICIOUS

PDF

78.9 KB Created: 2021-02-23 17:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1f5cc752f7849db9b608f2cb391befcd SHA-1: 87b226d8927a7888580c5476bc22e4dcc9381337 SHA-256: a9a8c8d2420ce2816e283c057547b046cfc1661207c15ffba163953a726186e1
126 Risk Score

Malware Insights

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

The file is a malicious PDF detected by ClamAV and an ML classifier, exhibiting characteristics of a link farm on disposable hosting. It contains numerous embedded URLs, many of which point to domains designed to host further malicious content or phishing pages. The PDF's structure and embedded URIs suggest an attempt to lure users to external sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=6th+grade+geometry+worksheets+pdf PDF link annotation
    • http://tiktokhd.design/439520481412uf41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_602d6f8e9a66a.pdfIn PDF document text
    • http://marketeuro.pro/reading_worksheets_grade_5k27pw.pdfIn PDF document text
    • http://copyrighthelp.info/analogies_worksheet_for_grade_4vi697.pdfIn PDF document text
    • http://potolkilife.ru/4._snf_classroom_rules_worksheetwkqvs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483346/normal_5ffc261422c3f.pdfIn PDF document text
    • http://brumbum2.xyz/ninoputubijudajigzftvh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412378/normal_5fed8eaae4c0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_60334580be9e7.pdfIn PDF document text
    • http://natorg.fun/how_to_write_amazon_reviews0awxq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_600e276293cae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420747/normal_5fcba5b62965e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_601e6eb43c3d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_5fd9042f6bddc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_5fc67d4c33cb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_6017be63b9451.pdfIn PDF document text
    • http://samo-katim.ru/telofusubogexalz2mwd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481064/normal_601efcf67fed2.pdfIn PDF document text
    • https://cdn.sqhk.co/zeterabaxax/aghhgcs/12707922308.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373516/normal_5ffd21228d0e6.pdfIn PDF document text
    • https://cdn.sqhk.co/ximirujusuxo/a1gdDha/98504057060.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 5740 bytes
SHA-256: 86aafba791e7ea3989f5c20e63111d0d2c5d9c3af36bbdb62f955da4ad43f452
font_01_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 11060 bytes
SHA-256: 6aa447490fe1cc10533d4320457633985ff4c47ebd76ab7303b052710a1b7d91

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