Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03fb6591fa9f9c5…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 11:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7e2ca104102bde248e269d1fa44f7f2d SHA-1: bf534bb4974de403aa04a97bddd4599e4de050b9 SHA-256: d03fb6591fa9f9c5def45a635b9ccca716d53ca4fead74a1082d5c1702862f8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing sites or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a spam or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=killer+instinct+apk+free+download PDF link annotation
    • http://www.sun-green.eu/ckfinder/userfiles/files/lizavesedumu.pdfIn PDF document text
    • https://somogyplusz.hu/files/xaforavepebirufufeva.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/38128291230.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/jisepiguri.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091101253473499.pdfIn PDF document text
    • http://dobski.pl/userfiles/file/41832374392.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/keridisuvutov.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109050446093154.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/1780398601.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/2670955298.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/naxivogevokusewijati.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/4052774320.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/82748746146.pdfIn PDF document text
    • http://jump360.co/upload/files/20210912202354.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210916060532_2050264189.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/zosujavesidifefugafut.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/89519746195.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/mitigakowupodebuzu.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/68988088247.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/xafazuvir.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/leniw.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/62463942207.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/69705657730.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://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_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 10784 bytes
SHA-256: ba5b688e1c339a561b489d39841aeda1e681b400a27f0c0f534c9b868e1eaf86
font_01_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 17616 bytes
SHA-256: e2836e9e4889a16d15695f779761eb9f7a11061e0bde3c8993c1267b0a1ac4fc

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