Malicious PDF — malware analysis report

Static analysis result for SHA-256 378fac8e51d6a54d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 14:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6dc3bbdb3e1eb6d9dab69be8e1e0720 SHA-1: b4130c3413a44b1c4fcf846af251e68d69954d0e SHA-256: 378fac8e51d6a54d504cad4dab59d0f05da9b236ecc5e64616642059e574bc40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The PDF's structure and the presence of external URIs indicate it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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
  • 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://tentauto23.ru/ckfinder/userfiles/files/44624070755.pdf In PDF document text
    • https://triosms.com/userfiles/file/31817139761.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/naxijogixitudubukiwone.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/gipufikax.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/93769153168.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9e86409edd9a3165b3998f85e99575f5/bodazabutapupafiviro.pdfIn PDF document text
    • https://spacio.hk/attachment/file/25864340697.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/didavo.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/xavivosafu.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/bakulozipowasa.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/xisokibipisazu.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/54104805468.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/55799589933.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/32227386633.pdfIn PDF document text
    • http://kunbot.com/upload/files/91849056296.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/ralitawokufup.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/1176970116.pdfIn PDF document text
    • https://digireg.com/upload/neloxojuzurax.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/59504158490.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/41108713634.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/bowixawanepanaz.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/22934958458.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/748k3tjanc065h2livutmfneah/34613572346.pdfIn PDF document text
    • http://zenkatsu.dk/files/22582722588.pdfIn PDF document text
    • https://yasacompany.com/upload/files/fozexarojoruz.pdfIn PDF document text
    • https://riwg.in/userfiles/file/roberowedemoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=habeas+data+pdf+colombiaPDF 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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 17840 bytes
SHA-256: 425117ddab690494001f7215479f5aed174e63aabdfbf1e01908e0a7b879150e
font_02_sfnt_off00012133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12133 10708 bytes
SHA-256: 6d20b4da49d4fe45f65103bd2c423bff2556a4724a05fc292be9939fe9c5c3cf