Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3baed747407c23…

MALICIOUS

PDF

84.0 KB Created: 2021-03-01 13:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6032feb2c4f8da83fb557b8e66f3f60f SHA-1: 0e64f596618cebd60780c3c51334d8d19ede71ac SHA-256: 9f3baed747407c233bd4c0e2fdac0d461140c0ae96b2fd2f8424468a7d0dfa4b
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, with one prominent URL pointing to 'baarspo.ru' and a query parameter suggesting a lure related to resetting a Samsung remote. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple PDF links, and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The ML classifier also flagged the PDF with high confidence.

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/strik?utm_term=how+to+reset+samsung+remote+r-nz PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502246/normal_5fc5a0dad4972.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/diiicjm/xufulepirigu.pdfIn PDF document text
    • http://changely.club/what_is_the_goal_of_lean_manufacturing0hofr.pdfIn PDF document text
    • http://dkshlyap.ru/graphing_parabolas_equations_answer_keyjma3l.pdfIn PDF document text
    • http://detonic-italia.website/66354260393u7e0w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_6007125eab8b1.pdfIn PDF document text
    • https://cdn.sqhk.co/zekuxemelop/if5ghjc/tax_tip_travel_splits_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/ihigN8l/xosarabapovujagixagolagep.pdfIn PDF document text
    • https://cdn.sqhk.co/dodagirojep/jdghDlD/16629498508.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/iKjdid3/tuzadeki.pdfIn PDF document text
    • http://gsmall.space/daretarowi8a196.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505820/normal_600193999836a.pdfIn PDF document text
    • http://cetakchantek.com/827798776415d9ow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fojiguxojed.epizy.com/92158333508.pdfIn PDF document text
    • http://bemeridalazobox.epizy.com/91404614796.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_off00010bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 5108 bytes
SHA-256: b43e4ab7a312bf29f9cd3c9ce87ae1c4810be5421fdcd4c060b2bc554d8942e8
font_01_sfnt_off00011d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5E 11032 bytes
SHA-256: 421efde712fa4130a0fc1077c8c2e4853b9b31219ec8870b812b0103e7643f51

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