Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec021f2471c4a053…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 12:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3b6bd4eaee6a9d42326d8aa50dafc2d5 SHA-1: a8c475ae2d27894f789a70057582034174727ef7 SHA-256: ec021f2471c4a05341d14a9eef670f7784d12b6d031e6c605880e42b122204b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are likely used to distribute malicious content or conduct phishing attacks. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the primary purpose is to redirect users to potentially harmful sites.

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://www.zochrot.org/ckfinder/userfiles/files/watul.pdf In PDF document text
    • http://www.ekoforte.com/upload/file/6872894390.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/34024489480.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/80565160525.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/kelugunijuxalowi.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/vajuzopoxube.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d86493cae4---medotidadusu.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/78105153938.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/78178420804.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/bunoz.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/23636568665.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/79002405743.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/93443331500.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/60830878228.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/vasowugukidumugobexewu.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/4774511906.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/befutipez.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210907172028.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/80145711093.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/17848253765.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c95354f330---papelorisi.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/43846327378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+root+your+phone+safelyPDF 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_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 10652 bytes
SHA-256: 88c721e5c38043eb302260c0f2cbed490154fbcabc63eaa1cbc28e8c362b7b3a
font_01_sfnt_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 17680 bytes
SHA-256: a6c9d0ae9be720dc8a2e5cc0e87cd592e774a26c1b1b6274c6fc8cff1b06dcfc
font_02_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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