Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acb226425fc766b…

MALICIOUS

PDF

74.3 KB Created: 2021-03-01 13:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 81fb59b4648f2af3dbd6d7f73ee50821 SHA-1: 7367da01095d7c845a5cad0b21d7732d9b904a56 SHA-256: 2acb226425fc766bfeee532bd3224cdbc9730033fee8161e46506b69eb38bcbe
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically linking to 'kuzutuzo.ru/strik' and including a product search term, suggesting a lure for phishing or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to host numerous links on disposable domains. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports the malicious classification.

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://kuzutuzo.ru/strik?utm_term=skyworth+smart+tv+55+price PDF link annotation
    • http://psychologyrelax.xyz/pilot_flying_j_apphcixh.pdfIn PDF document text
    • http://rat-red.space/lista_tascon_downloadxbjtp.pdfIn PDF document text
    • http://alphabitx.com/prehistoria_etapas_y_fechasir6wt.pdfIn PDF document text
    • http://bridgecommerce.com/2_player_card_games93lfx.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/5750602946.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bogurivesinoni.rf.gd/54980234927.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/guloz.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/ielts_general_writing_answer_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/bassinet_fitted_sheet_adairs.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/new_year_s_resolution_planner_template.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_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 5688 bytes
SHA-256: ec507948adcbe3c87dd6f16686fee813066df0a245c7c2b67f656c7cf5686016
font_01_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 10056 bytes
SHA-256: c0b9d8e93cf283e788e092474bd6b5be23e50015423f697c423946bfc6f8ec5a

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