Malicious PDF — malware analysis report

Static analysis result for SHA-256 314cb4c79341a5af…

MALICIOUS

PDF

70.4 KB Created: 2021-10-02 11:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c8e545a62ce7eb16d0a390e61df5447e SHA-1: 8535a715b76913af2a325645e446482eb134029d SHA-256: 314cb4c79341a5af17df67139fbe328cc798477026063573fe5f6616d6760492
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to host a large number of links, likely for obfuscation or to spread malicious content. Although no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/renupudavulenu.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396847125f6---7184222158.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/verujasupituruw.pdfIn PDF document text
    • https://satesayap.com/contents/files/fimam.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/kuxebetojolevuji.pdfIn PDF document text
    • http://raovat.coi.vn/uploads/userfiles/file/xubazefokodavubufujezaw.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/36128666073.pdfIn PDF document text
    • http://findacommodity.com/upload/file/59023148617.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/zipapaderi.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135a3e1c2e56---lumudanagomawu.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/4784535315.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/zepab.pdfIn PDF document text
    • http://dsagco.com/Upload/file/bevubipanimes.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/nuwijopat.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/24919096266.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/15965961113.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109020100294745.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/28392277600.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/gutedopeluvodumopi.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/gozopotudobazimere.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/tilixeredit.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/limofelufapifuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=safety+measures+in+construction+site+pdfPDF 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_off0000adaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAA 17488 bytes
SHA-256: afd030b9e158abb8de377e80a0e9f06679960b319572cb81e086c3aaaca17454
font_01_sfnt_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 11024 bytes
SHA-256: 82def2ad563fdd8aa0ea27591e314a48b35dbf74ea60f9c3f1afdc7869d7ac57
font_02_sfnt_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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