Malicious PDF — malware analysis report

Static analysis result for SHA-256 836f5d56d482d1bc…

MALICIOUS

PDF

64.6 KB Created: 2021-02-22 08:00:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: be430115f57bada0d41591bb2b8b3576 SHA-1: 0b1f923b91ff57478891ee2f1a1d22af079b17f0 SHA-256: 836f5d56d482d1bc0cc784652d234fcda949824dd427a35413c63a59a2c76ae0
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=dell+inspiron+n7110+ram PDF link annotation
    • https://cdn.sqhk.co/jiguluzufuwa/1VAjE72/wavagirufasodedup.pdfIn PDF document text
    • http://bobixuposu.22web.org/geographical_information_systems_officer_pay_rate.pdfIn PDF document text
    • https://cdn.sqhk.co/pelemobi/dBhcjby/rumanunoge.pdfIn PDF document text
    • http://my-favshopf.online/84948279197v2kk8.pdfIn PDF document text
    • https://miwebuzoz.weebly.com/uploads/1/3/4/0/134095964/20a57c2.pdfIn PDF document text
    • https://rebopugosoge.weebly.com/uploads/1/3/5/3/135346619/nulobugopose.pdfIn PDF document text
    • http://kukikifo.iblogger.org/6578846854.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tanozetodane.rf.gd/lonojizudomavudaxurinuxo.pdfIn PDF document text
    • http://sufumawug.epizy.com/ayyappa_swamy_songs_telugu.pdfIn PDF document text
    • http://zowujobosega.rf.gd/android_studio_create_a_jdk_configuration.pdfIn PDF document text
    • http://wopugizejaru.rf.gd/96087696715.pdfIn PDF document text
    • http://gonesipida.epizy.com/11416664149.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_off0000be51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE51 5236 bytes
SHA-256: c0aa0b92f07c8c10f8deec3378d236854418c2a9c37764968d52a12d6781dfc2
font_01_sfnt_off0000d01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01E 10700 bytes
SHA-256: 140ca6b03817d04c2a6de6a93edbf6bd8c35afac7ef74f1a24651dceb4eb0926

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