Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99b03b1a461b523…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 17:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44b0e9c7460e4faa4eae1189d494fc1e SHA-1: ec8865cac72278b1ca864697d4d6ff3bf934677e SHA-256: a99b03b1a461b523769a27b9645d0a1a0fca67c56cdcb4a37da689ff52555ed3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high density of external links, many pointing to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://allytemp.ru/uplcv?utm_term=tamilrockers+2021+movies PDF link annotation
    • https://khabul.mn/mmpa/userfiles/files/rafilefiseridiwerakuso.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/muxivu.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/fibutizorir.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/33201585264.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/xisedaxiwuxakepuvezesuf.pdfIn PDF document text
    • https://blugarden.eu/file/46331382932.pdfIn PDF document text
    • http://podarox.ru/public/files/40105269563.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/lufevideli.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/17900428729.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5994690d---vefovetadekafid.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/95398314171.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/92245233652.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/10214165439.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/58776368719.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/dinebudizate.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16138accabb77d---luxovujeguzazede.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/mokosabevawiwewatines.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/29702914870.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/89676882032.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/74811245706.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/78762332036.pdfIn PDF document text
    • 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_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 10604 bytes
SHA-256: e24768e231a4ad67850b24c022dee717a2d4d975e21888ed027f9e00e07c09e4
font_01_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 18388 bytes
SHA-256: 6090190a638e056a3d1fe44b6bdbec5d367be016d7f35d902f47f4898aaa8aa8

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