Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f954fa24bd9bb5f…

MALICIOUS

PDF

62.5 KB Created: 2021-09-17 01:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4d2e9b0548961a4abcae33f5f21cec3 SHA-1: e0f3b93aa3dfba872aa94bd995c5690c19e06ce0 SHA-256: 9f954fa24bd9bb5f998fc80cd399d27dfefd20e2f711f8baa8936dd61d1917c7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or SEO poisoning attack. The PDF's structure and the presence of external URIs strongly indicate it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8035

Heuristics 4

  • 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
  • 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://coretry.ru/uplcv?utm_term=video+downloader+apk+for+pc PDF link annotation
    • https://lenaoyunlar.com/calisma2/files/uploads/9786648086.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/21276061206.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/zarorulajuvun.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/54724163265.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/tunifugufoxika.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/6548382174.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/redetudosukuzu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135646a2cb98---15610979125.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/segonorakedavajedavolife.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/70592954791.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/84126216976.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/18257471353.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/bomevujewidonilolajojal.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/98249058981.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/8456449937.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/9141506579.pdfIn PDF document text
    • https://campermagazine.tv/public/file/rixigojejukixasep.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/80157044021.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/2691827623.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/30216438846.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1