Malicious PDF — malware analysis report

Static analysis result for SHA-256 c112dfa36d12abed…

MALICIOUS

PDF

66.0 KB Created: 2021-09-15 17:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1f294b49815afa33487f1dd2585f855 SHA-1: aff81a8d03b6ca32e828dc9059698632c33ec03d SHA-256: c112dfa36d12abed212564456fbaaebf26e7f36902c796135421d93d82b7074e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9137

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://ketchas.ru/uplcv?utm_term=whatsapp+apk+download+2020+latest+version+free+download+whatsapp PDF link annotation
    • http://geasit.it/userfiles/files/61884821387.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/55468081112.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/32154776120.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/63664459384.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/jezaduxuvegun.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/rapadawavafefu.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/21847348356.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/pinotefajute.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141914b1086e---fejogagol.pdfIn PDF document text
    • http://hopkim.vn/upload/files/korepokepawesototurar.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sfdr5ee195nmoeoi373msq90n6/pepovikobadiwaziguni.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/vatitog.pdfIn PDF document text
    • http://sieuthibds.net/images/files/95933671828.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/kuzugawipunodenopujezojo.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/tokuweroguzozaboviden.pdfIn PDF document text
    • http://only-svet.ru/upload/files/14045975226.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/27076145738.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/86369114545.pdfIn PDF document text
    • http://schubert-hh.de/image/file/90463231195.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/satofujopanarugiwuzu.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/60630435246.pdfIn PDF document text
    • http://ave-france.com/pics/files/55253483493.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/98903920181.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_off0000d755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 17428 bytes
SHA-256: 24921d6c66b9cdf32012923eab01451b3293ad65b2b0effa2108047da9554fe7