Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfc8f16cb80b23d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-12 17:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7c66e342773150442ca528644aff7f46 SHA-1: cd97c8f0b04208c64a85918d8a8a901bb95cc525 SHA-256: dcfc8f16cb80b23d65025cca19ed1aacae0e89f674466015607d034b41fd7853
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://hitecds.com/userfiles/file/46063106631.pdf In PDF document text
    • http://drsuthichai.com/userfiles/files/63943516343.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/xirojiburazamara.pdfIn PDF document text
    • https://tsolisp.com/files/file/98708600265.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/5004735346.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8d1db3ed---sabar.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/midugajokezivule.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/baziboz.pdfIn PDF document text
    • http://airfa.it/userfiles/file/24280406063.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/tujafepesafodopi.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/71732119027.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/degafinaketarekewetibof.pdfIn PDF document text
    • http://na3.it/misc/file/sesuwafa.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/25799041445.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/zelinubirevevijewupazela.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/52851606822.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/poxupejejofunapazifuw.pdfIn PDF document text
    • https://toocapen.com/files/gozerabumuvakexomi.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/zelefud.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/xapamo.pdfIn PDF document text
    • http://metallpress.info/files/6995917159.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/97683094170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=best+tools+for+hacking+in+termuxPDF 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_off0000e07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 18576 bytes
SHA-256: 09882112f0f1cb5facbb3b648f60544e612d633c8b94bcb173723ea2eedc8d1b
font_01_sfnt_off00011031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12848 11132 bytes
SHA-256: e9666ff9557ec83b9a85a2ed77b698da2f9eba782405fe9b57581e2ee40e8a12

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