Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b09242c4acf380…

MALICIOUS

PDF

80.0 KB Created: 2021-02-25 19:22:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 02a568677d5680d9fa64fc7edfe6434d SHA-1: dd7ae2030b79a5606d4d595f1dbceb0a9d75f04f SHA-256: 05b09242c4acf380ae51e769492bc8438d99c6ff5f10fc1fca5a614fd89a2654
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 critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or traffic-driving campaign.

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://seumenha.ru/strik?utm_term=who+is+number+1+apex+predator+season+7 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4493888/normal_5ff368a8f110a.pdfIn PDF document text
    • http://wodebawoxisire.22web.org/what_is_area_code_809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_5fd23a6ad5039.pdfIn PDF document text
    • http://wersita.fun/robilukeresotuvedkgv6.pdfIn PDF document text
    • http://ericksandoval.com/eso_crafting_leveling_guidewfmwq.pdfIn PDF document text
    • https://boderaraza.weebly.com/uploads/1/3/1/4/131454415/dixije.pdfIn PDF document text
    • http://sfr-espace.best/27872621738io5sy.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/free_printable_maths_worksheets_for_11_year_olds.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/nuwexexocm3po.pdfIn PDF document text
    • https://sedonefuwetupo.weebly.com/uploads/1/3/4/6/134669082/jogopufokav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piredesoki.epizy.com/ubuntu_16._04_iso_image_for_virtualbox.pdfIn PDF document text
    • http://nabikelotedabe.epizy.com/nenerubaxo.pdfIn PDF document text
    • http://fixelelediv.epizy.com/shutterstock_photos_without_watermark.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_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 5520 bytes
SHA-256: b35f3fc3b8036ec4dc5577292d26601e2183239dc30c52a1bce1565652662e26
font_01_sfnt_off00010dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 11172 bytes
SHA-256: 05294edd67027f2c71e13448a7ddcdf314b05bf0d1f682f3d67e988907ade511

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