Malicious PDF — malware analysis report

Static analysis result for SHA-256 328ea562bccb4a45…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 04:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5be2443659be35b8aaee96441d6cbfe0 SHA-1: b46e0ba7c3347d1af105ca8db27ce0204ff906ca SHA-256: 328ea562bccb4a450aa93fab1c10b81a7fc3c0c5225c3a67e1f6236dd2223021
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to create a large number of links on disposable hosting, likely for phishing or distributing further malware. The ClamAV detection as Pdf.Phishing.Trojan further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3768

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 http://pk.mo/userfiles/file/26696550942.pdf In PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/jiwewixubuno.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/66275114477.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/6599822979.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/bitodakatenenubuvefidos.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/buwajigitimanared.pdfIn PDF document text
    • http://mebco.ru/images/file/xazujenepekabepitof.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/49837994721.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/81327566731.pdfIn PDF document text
    • http://xprchemical.com/upload/files/girogativotazin.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/butuwe.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161467272af306---pepalavexuzuwitaful.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/84500930193.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21767394998.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/kagitovubeke.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109060630281544.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/64006683197.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/75415317780.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/nowijulofob.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/tezededalumegupolakiwi.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/dokorulosugugat.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/tl31m7ocro00ivquf03orosbi5/86978046048.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/95819028402.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/96250404004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=10+class+science+book+pdfPDF link annotation
    • 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_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 19696 bytes
SHA-256: 1a78d30c619eacb98fa9673d111d531f3acd32fc109ee42d49a62fce73c15a71
font_01_sfnt_off000108bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D2 10724 bytes
SHA-256: 7c0eeed9cee4603eafbf948b689cbcc79732a5b3e3eab57a3badfc56a3b819b6

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