Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c4cb4ef5cfc9c0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 06:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e14828e0c331af45a73e58498b3cea6b SHA-1: 2a1ca45c5c517547d20129f331208ec55718bbb5 SHA-256: f3c4cb4ef5cfc9c02dc49d3a11833932aa27b967aef2d1149b10687bf581e94a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a credential phishing lure. The embedded JavaScript and numerous external URIs suggest an attempt to redirect the user to a malicious site for credential harvesting or MFA abuse. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the heuristics strongly indicate a phishing or MFA-stealing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdaa21448e---fedajewatogawawugof.pdf In PDF document text
    • https://profix.fr/ckfinder/userfiles/files/49171370464.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/4746013117.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210907003531.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/3676732051.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/duzotewumonimimitu.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/29181393623.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/85197161268.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/4618145129.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/zobelamik.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/geled.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/sutuzusawemowok.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210904142731.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/7460644643.pdfIn PDF document text
    • http://dd-eng.com/files/files/sidanidavanusapa.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/g33lht57bbr8mmtp8uv7m44fu6/512987079.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/titulutirudavamaweja.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/54364402675.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/81218251818.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/pisulozetiwerizux.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/sugemaxibituludil.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/35907632420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=react+native+ios+deployPDF 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_off0000dcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD5 18876 bytes
SHA-256: cf18a327ec4407b46cd7233b85735bd1c76d90dfeb26435501718d795db8302b
font_01_sfnt_off00010e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 10632 bytes
SHA-256: bd214d009cd73fa9f7903baa14e3a84811f3880484e0c93f5cc0c9337f459f28
font_02_sfnt_off000126cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1