Malicious PDF — malware analysis report

Static analysis result for SHA-256 831e17ece4a93ea8…

MALICIOUS

PDF

58.4 KB Created: 2021-09-18 06:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f8295d5254f3d1c413c4bc279377962 SHA-1: 2e9b7e52226e7d816da7ba91e8fa844bf528548a SHA-256: 831e17ece4a93ea84e3c457e7bcbe3fabed3b420dae218ada1231f1c6063e5f3
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URIs, many pointing to potentially disposable hosting, suggests an attempt to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7660

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.
  • 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://soi.icami.mx/ckfinder/userfiles/files/91729035498.pdf In PDF document text
    • http://doubles301.jp/files/ckeditor/files/36298921831.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/90025234908.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142582f88fa8---6673668675.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/1457823469.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/11282770329.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/fazokaviwitibatumoxup.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/86789665981.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161415633a99ad---6602448845.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/sosinobomoluzitutulezese.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/15538739950.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/30720715580.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631771354.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/kidigubesanelurof.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/68068683107.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/duvukinejoxufi.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/736744888.pdfIn PDF document text
    • https://digireg.es/upload/11680692290.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/vadinitemabelurosipezepa.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/4346078375.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/wafunuzawuretuwibona.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/91948091700.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/53553588965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+the+wind+in+the+willows+pdfPDF link annotation
    • 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_off0000c060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC060 18760 bytes
SHA-256: 53f8eb90caca8c61da81c0baf4fdbb1caf3a60e5bac4ce6370b7e14b381a8f93

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