Malicious PDF — malware analysis report

Static analysis result for SHA-256 046c3f49e93f8ac7…

MALICIOUS

PDF

61.0 KB Created: 2021-09-29 09:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 79dfe22af17d6374621ae51bcc89bc03 SHA-1: d4e9f5e58f378614f1a6a55caa7e4c7f1c622454 SHA-256: 046c3f49e93f8ac747ffba8a46d4d391058aab555cb9b89b7701fc29ff15f751
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7754

Heuristics 4

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=how+do+you+screen+record+android PDF link annotation
    • https://adminico.nl/userfiles/file/47242661967.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/47093514141.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/56073525178.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/77195677514.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/46745893733.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/lubejajirabalovovolofaxa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613105a54e83b---65780280339.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/katejenawulamilelasu.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/33102035437.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/wawirisaboxugapos.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/22779412698.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/zuzebi.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/jiroxoluzonowejevegore.pdfIn PDF document text
    • https://jin-ji.com/upload/files/81511977401.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/xadexademu.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/1095312000.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/91968354111.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/61672746446.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/milapoxomum.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/34336480284.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/72049562322.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/50965964832.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/gesivatelarufafurojovadi.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/nomopufululoz.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/67441337623.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55B 10508 bytes
SHA-256: 078028f8de3796d13a7944cb31bfa7e866b884d7077a261cb2b93969c50674d8
font_01_sfnt_off0000cd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 15948 bytes
SHA-256: 7c4366ed720054be889d76c05db1b50b01ed1a60e6f9f7040141de1bf70eb833

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