Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e92b38eabda4196…

MALICIOUS

PDF

88.8 KB Created: 2021-09-19 06:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c41ac4aa72da68aacec19b7c6cb620cf SHA-1: c83a60eb9c108989d91ae1254a658748cf033603 SHA-256: 3e92b38eabda419649bc983d27bf1c206bc252526db1a088ce1ef1b929a99718
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest an attempt to lure users to potentially malicious sites. The ClamAV detection further confirms its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3165

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jajugroup.com/ckfinder/userfiles/files/dagukijagexamoponudet.pdf In PDF document text
    • http://findingthegrey.com/userfiles/file/16006094277.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/80412941698.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/18152688691.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/juledofisemamax.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78552379158.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140127c50254---71467030468.pdfIn PDF document text
    • https://sinarwaja.com/account/files/77926372503.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/nazonegodomatemefa.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/gokarifak.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901150937715763.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/seguxibag.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/94615763041.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/112056195870.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/10846565337.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/4154749746.pdfIn PDF document text
    • http://devveb.net/userfiles/file/mefezinuniwigijezuferos.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/voketajasigudile.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/82701120195.pdfIn PDF document text
    • http://irollee.com/userfiles/file/92264371743.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1407a942---rogurosalaj.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/rokuxopebirugogerubal.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/65470508955.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/66328411877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=simple+interest+exercise+for+class+7PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 19924 bytes
SHA-256: f8ce055f206ce13a9ad4882b3bfdc36ea1a4921f46ccee0acbae03b459ee4024
font_01_sfnt_off00013c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C06 10868 bytes
SHA-256: dfa00a61dc3a1e4fb71ff65115fdab7832ef11551aecba0f5a615e2d5faa10da

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