Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9bf59e3b47b442…

MALICIOUS

PDF

71.2 KB Created: 2021-02-22 07:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dab6882e23e6d934bb3bd7b612351ffd SHA-1: f6eadcc7b995facaabe4b2508ff6c87b3d8ac6dd SHA-256: 8a9bf59e3b47b442c9e5afba72f98c5512e148a14fc22bf0690b4af15d3397a6
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or scam attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this. The ClamAV detection and ML classifier further confirm its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing lure designed to redirect users to malicious content.

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://druttle.ru/123?utm_term=hp+laserjet+3015+toner+12a PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450630/normal_602205ff3083a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471096/normal_60313dbfc55b3.pdfIn PDF document text
    • http://denizan.com/fatuvudabavawuwavalahser.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403274/normal_6000913e03b96.pdfIn PDF document text
    • http://topstop.site/5334268197815ncr.pdfIn PDF document text
    • http://salearea.pro/how_to_program_honeywell_vision_pro_8000tep6n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_600bfc05617d8.pdfIn PDF document text
    • http://idealica-uficiale.website/5081484078cj20c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fd05b7feb33c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_602d9c18848ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_60322ceab71b6.pdfIn PDF document text
    • http://particulieres-societegenerale.best/windows_10_bootable_usb_drive3kz6n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473954/normal_6026d282a172d.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/39225491590rx1er.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420451/normal_5fcc269bbc1d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/text_to_speech_reader_software_free.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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 5464 bytes
SHA-256: 162e7c0d3b89e5317efec38c718f5e39e351b364eb800315d1ea43b571b6a4fd
font_01_sfnt_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 10172 bytes
SHA-256: dbc44df299a90d9305a36c30950817dfd5631b53359b5582f6cea58ba4ed3079

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