Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3186f37192d871…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 06:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd6248ff676243873af84b67e7fc6f29 SHA-1: 6bd1bca4bc70eb57a3aa192b68182cc1b8044978 SHA-256: 7e3186f37192d8711601635b139c5772fb5482ffeeed10b8009e588fd5e36c90
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and is classified as malicious by ML and ClamAV. It also functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. The presence of JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://iieng.org/editor/ckfinder/userfiles/files/60086549220.pdf In PDF document text
    • http://omgmediatank.com/userfiles/files/9061265009.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/9260086220.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/88788498722.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37738930359.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/nugatafuzepositurovulos.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/fetokaj.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/jazorubadomuz.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/96935746388.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/vubupesapapizuj.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/kepeporarut.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/94896360637.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/vovowowanekuz.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/7592858362.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b267b6dd5---42529196110.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/65419676336.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/wibesesefilaranote.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161386062c7d21---70166606246.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/saxitabokas.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/tenonirogevabutinusup.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/72676526662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=apple+ipad+mini+price+in+pakistan+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000d30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 18192 bytes
SHA-256: 5132606dbbd90751a5d893be2d8cf6c29bb6e47f0f7c4eef2faff46970c692e0
font_02_sfnt_off00011b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 10872 bytes
SHA-256: 4d46dc073a869d78302e49d1ecef58fbac0ccd8cd4734d1f100dd5d770929d2b