Malicious PDF — malware analysis report

Static analysis result for SHA-256 8724a594a4c0e13f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 10:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 746d670bd9e7c4fb860d7123ee69c342 SHA-1: 629d10c8e0d27fb6adcecdf328bfd9995907d86c SHA-256: 8724a594a4c0e13f1d6d5d965a3a6c99759319d93147964813b5e893952e932b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://phantasos.org/userfiles/file/mevogifone.pdf In PDF document text
    • http://mmsmarin.com/imgimage/file/21516169009.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/levik.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/62676256004.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/29396215038.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf1ddd57e---bigumapedejevafipe.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/81120405970.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/gidak.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/52912211744.pdfIn PDF document text
    • http://keyday.ru/files/files/daxomasi.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/jututakiwinutuv.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/92952408931.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/82dd4df4c9bd9e7ba2f519eee541a8bc/nedopuwedixukijoli.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/fuvata.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///18434300081.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/89959401560.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/95601525127.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/juzipobasezafuwuzej.pdfIn PDF document text
    • http://lactopad.com/uploads/files/setuxepevedil.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/3248314194.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/ralorikif.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/fowujatep.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/60450871409.pdfIn PDF document text
    • https://vleek.com/uploads/files/62172283503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=anatomy+for+fantasy+artists+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_off0000cc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC40 17692 bytes
SHA-256: 17b1a51ce47f0412dddb611f11870503e86cb1dcc8c72bf3162d2f62d0e524b6
font_01_sfnt_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 10576 bytes
SHA-256: 01d67f4f1e4df9a4579040377028c6200599480d617b3abc1876e1443aeb0139
font_02_sfnt_off000111dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1