Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc3ff429431cf34…

MALICIOUS

PDF

89.5 KB Created: 2021-09-15 12:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c1c817c1d5bae900af4a94c84caf0a3 SHA-1: defa901da51570190e60b8ffe17378e77192b799 SHA-256: 8bc3ff429431cf3441b7ad8d7c428c4b148a687afea1a31297f622ddd1f36d20
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicating a phishing or link-farming scheme. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://phutunggiahungoto.com/uploads/files/41220168867.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118091c0bb---bipowalid.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/tititirekezofanakofukewi.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/pudenatoxibezijuzum.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/kogolav.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/63422420919.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/2340924990.pdfIn PDF document text
    • https://tierlistei.ch/downloads/tavone.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/fuzufil.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/vuwafinu.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/41081816362.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/88612927051.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/zufegubodedodo.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/sokapiga.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/denenolidizapofisuba.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/zukibafanumadijaj.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/darajumanakat.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/71734781879.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/57688678200.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/zogarodasugopome.pdfIn PDF document text
    • http://hasyo.net/files/file/renibebonifivojiz.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/96099024681.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/nimatunugobut.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/bovanitonejolala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+close+apps+running+in+background+on+androidPDF 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_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 18428 bytes
SHA-256: 4ee3ea92e9bc02efe11b1e5a9fa057ab757d69c592d979a736cefdfb0a156ce8
font_01_sfnt_off00012610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E27 11100 bytes
SHA-256: f7971e44ccee86f52f6f43228bbd9290bc4d55f5bc2bbccd42425c25908f5341

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