Malicious PDF — malware analysis report

Static analysis result for SHA-256 4457d9ce4e45e90a…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 05:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6479662b9e2398c27803c944f90abd8e SHA-1: c0155524bc808e17c716921643e19cbf93baf75c SHA-256: 4457d9ce4e45e90a0100669b39b8a6e2e056e4affaa917819722d27cab9e73fa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to the link farm, which in turn hosts further PDF files, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://scard.vn/app/webroot/uploads/files/wamatapawuxazefubu.pdf In PDF document text
    • http://brbud.pl/userfiles/file/38056646151.pdfIn PDF document text
    • https://digireg.es/upload/nitunufizebovagopa.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/tavusabilotovawagu.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/bulonetopotajejijib.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/44279312554.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/zipuwo.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/52328119948.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace768d7db---jinededupovojegugazexi.pdfIn PDF document text
    • http://p-energo.ru/content/file/gowasumuveji.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/20059778106.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/zudevasudubugere.pdfIn PDF document text
    • https://lorus.rs/files/99052582116.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/wojivosape.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/wisivig.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/6403014873.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/82997381559.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/reratokegugomilem.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/63555006517.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c103d4094d---fatotidevadenebabazuride.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/siginekufifi.pdfIn PDF document text
    • https://olterus.net/contents/files/mukazuwagopezoru.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/zujuvilipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=d%26d+3.5+players+handbook+3+pdfPDF 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_off0000c7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B3 21536 bytes
SHA-256: 2adb479046ac30187a60e308cdbffc3e1d92f06c5d39070ac774ad663fff0710
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001187b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8

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