Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51bdb03bfd8f23f…

MALICIOUS

PDF

66.8 KB Created: 2021-02-14 04:24:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4710dfc045063b2959230d3a3dec2b68 SHA-1: 220791276d8e562b36b3b2c9727983cfadd6feef SHA-256: d51bdb03bfd8f23fd05e887d95c2eefec5e164af8dc7c82f5b317078a1dfb299
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to disposable hosting, and is described as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful content, possibly for SEO manipulation or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=vampire+the+masquerade+bloodlines+2+outfits PDF link annotation
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/57e2a.pdfIn PDF document text
    • http://toguvuveleguna.22web.org/31456223552.pdfIn PDF document text
    • http://galubiwigo.iblogger.org/94595546572.pdfIn PDF document text
    • http://aarbuz.space/kizuwagnzll.pdfIn PDF document text
    • https://somubafe.weebly.com/uploads/1/3/4/4/134444697/8291979.pdfIn PDF document text
    • http://mmuuue.space/27004449463jy6rg.pdfIn PDF document text
    • http://onlinekartiadesi.com/91415178180uqa5c.pdfIn PDF document text
    • http://italia-doc.space/sales_and_trading_interview_guidexrupa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guvivewemubalef.epizy.com/adverbial_form_examples.pdfIn PDF document text
    • http://mezotavexojo.rf.gd/altruistic_adjective_form.pdfIn PDF document text
    • http://wonumamirevaz.rf.gd/59537676752.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_off0000c921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC921 5644 bytes
SHA-256: f49c177f9da060ae6ff72f7f1f6e8f7b21e8d423d85cd6e0d12af3be34ab79be
font_01_sfnt_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 10016 bytes
SHA-256: 0d552be6b0b495ef5b6b6eec7ff451e03e911cfdb5842c5d0f1386e1e592c2d2

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