Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53e33cb84773d99…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 00:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d785fa1c56ef140d137c5296a635015f SHA-1: 690acdb46d340dcf4b12e9e1d2224512cac97a82 SHA-256: e53e33cb84773d996d12071b4950c018bc3b9a912cf18dddbe71aadb549899b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to potentially malicious domains, and exhibits characteristics of a link farm designed to obscure the true destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this document being used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tradingphrases.net/userfiles/files/58790029214.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4f018fb79c8370af43d77b7e390f84b6/nenepabuwekajubanuxebod.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/3156675558.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/88845839947.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/zabifakevuwonugi.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/kadomapigezotewal.pdfIn PDF document text
    • http://oris-am.com/editor_up/biligegoxufopujakiza.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/sufokakometesupiwajerogo.pdfIn PDF document text
    • https://fultoys.com/userfiles/bevaluguvudazifoboxaleg.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/77842564941.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/22171932812.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/12564824460.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf205e5fd1---gapudupoxogivivunobar.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/10872574932.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/24108927239.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/wojupugeromux.pdfIn PDF document text
    • http://agavietnam.com/img/files/54079595911.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/mobekukarevu.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/3512033836.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/34085621250.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/46201942897.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908202647_wnhyli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+go+spoofing+no+rootPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 10584 bytes
SHA-256: 32ad262ef41c7d1652698e2935183cd770c4b9e3ec7fdf9862bb0ad0f7d25506
font_02_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 18408 bytes
SHA-256: 155036d8f1098c31acc20062c0d21537a104bb593ee9f06b68843788dfcbc66f

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