Malicious PDF — malware analysis report

Static analysis result for SHA-256 05bfd8e105904595…

MALICIOUS

PDF

65.9 KB Created: 2021-02-25 21:27:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5105627e86a7b4a741eaa7f46cc84819 SHA-1: eb70c3b1f37e032d7b49069ada13ba85ccfbe878 SHA-256: 05bfd8e10590459580cb8384d4091dcc03ca09a08e2437ca4fc537464fef4cb5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to host malicious content or redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

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://baarspo.ru/award?keyword=how+to+load+porter+cable+fn250sb PDF link annotation
    • http://pozijuza.scienceontheweb.net/thus_spoke_zarathustra_review.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/how_to_write_a_reflective_essay_sample.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466661/normal_5fc8b00cdc9d7.pdfIn PDF document text
    • http://kiwufaninini.22web.org/10759553082.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/unicorn_cx2100_electronic_dartboard_instruction_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408701/normal_5fdd41099ac18.pdfIn PDF document text
    • http://hiziryigit.online/graphic_design_the_new_basics_ellen_luptonlcp0t.pdfIn PDF document text
    • http://quinzsy-studio.design/discovering_french_nouveau_blanc_workbook_answer_key3bs3j.pdfIn PDF document text
    • http://italystore.pro/essentials_of_assessing_preventing_and_overcoming_reading_difficultiesleizj.pdfIn PDF document text
    • http://rm-swis-mine.com/kolasajusaguwod2iv3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391308/normal_601da3e8197a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobobojisuwifip.epizy.com/joomla_website_free_templates.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_off0000c42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42C 5740 bytes
SHA-256: 91271e83fd962897a1e2ffd236dcf6304209c23caf2ca512718874dd859ac41e
font_01_sfnt_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 10252 bytes
SHA-256: 397d320eebd313f3fe2d5ff3e95cc1f3c73d568f518266d974f3c6a4bd38a11b

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