Malicious PDF — malware analysis report

Static analysis result for SHA-256 668d3de36546fc19…

MALICIOUS

PDF

70.9 KB Created: 2021-09-15 13:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eba51020fe8cc813c19598d689595528 SHA-1: 4e8be45609778e51a0fbd5537f8edcd7e2ebadeb SHA-256: 668d3de36546fc19a944b3fa1a3d73a74ed2ffbbfa5585ac9b71d20b8157a39e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, a common tactic for phishing or malware distribution. The PDF's structure and the presence of external URIs suggest it is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://cructi.ru/uplcv?utm_term=my+talking+tom+2+play+store PDF link annotation
    • http://ucg-eg.com/userfiles/file/31734649494.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/98597347051.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/pagubavedeke.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/88573503778.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/titid.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/rokugexalonisaxudumosu.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/80481288262.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16304976964742.pdfIn PDF document text
    • https://hotelcorona.ro/files/92219628043.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/7602240072.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/mabivumupapuboguzimo.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/50426145237.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1b75f69bd47dec5089f9350739087be/wewoxul.pdfIn PDF document text
    • http://soc-in.com/data/media/files/xalupurog.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/12371166807.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/venajedubowumutodifuz.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/gumepatemuvetujowep.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/44767829007.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/19076352756.pdfIn PDF document text
    • http://minerva-collection.net/files/files/37334181616.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/xevabawaxigepesu.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/18004522412.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/64560289578.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/41465720897.pdfIn PDF document text
    • https://iwistw.com/upload/files/44328177522.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ad5a431e---nusinebikotoxad.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_off0000b5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE09 15096 bytes
SHA-256: 3e48def657be4e67c0544e0496e6469b10430c632e04cc965c3dbf8d046e70c6
font_02_sfnt_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 10916 bytes
SHA-256: b85424a51b18677d71b7c7444446049f50c60509cfe6b45b152fb9c53ee8e087