Malicious PDF — malware analysis report

Static analysis result for SHA-256 384a530c9494c6c3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-11 23:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 786cdd2fdd880f9d66faa7abee161148 SHA-1: 158de04a17f41731c32c32faa18bbcc9e23e9f14 SHA-256: 384a530c9494c6c3432bd282907cb4285c16188baedde00f6d88376bedd864ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://westernmaki.com/uploads/files/vabugiminepo.pdf In PDF document text
    • https://tyko.pl/userfiles/file/71504075665.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/95229594749.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/puhq4a81nu0lje4cgv25i51rg4/26101596610.pdfIn PDF document text
    • https://preciseenergygroup.com/media/zofibipezuxizudimado.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/tapop.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/57023963444.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/jerakumesi.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/vezunogenijudupimunul.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/pimexaded.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/58393245854.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3eae4b198---89842105847.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/19387892584.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/36223584641.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/pokewajosixoput.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163114872791.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/49590947943.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/magibexitesoxe.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/87896506159.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/93929431628.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/malejew.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/zisif.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/95831383915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=beautiful+widgets+android+10PDF 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_off0000d539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 10940 bytes
SHA-256: 9cc435aa3a864c9e55e3ea147ce9f6319f60b30d7ae16e3962f22df4e28ac35e
font_01_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 16796 bytes
SHA-256: 00c92609d02da0171f2c0501ba4e8fc3ec20c92c1ecbab8a457f8be5e1cfd017

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