Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc52c0370fb169b…

MALICIOUS

PDF

77.4 KB Created: 2021-09-10 18:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6da1c091e80b59a0a612ac09798aa032 SHA-1: 0af90637399594e38e4e49fd60f44968c028cf6d SHA-256: 3dc52c0370fb169b92db2231c04f45af651a387f554a8c1daf66e2795c7cee73
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to obscure the true malicious intent, which is to trick the user into downloading a password-protected archive. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware delivery. No scripts were extracted, but the structure and heuristics point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613642cf87c2e---99839072615.pdf In PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/nenitotevodugorujobakoju.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/54697691352.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/nazosajagufotabad.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/70912291372.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/pugifipufofimoje.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/67837529707.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/kafenoruxo.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27591754218.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/birabaje.pdfIn PDF document text
    • http://wernitznigg.at/files/25006152549.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/42321252840.pdfIn PDF document text
    • http://rnralpha.cz/res/file/69628293141.pdfIn PDF document text
    • http://espokebar.com/uploads/files/tejimekaxibusaxelonejebe.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/kituwemodegaxokowesozaxud.pdfIn PDF document text
    • https://cakkue.com/contents/files/21232295480.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/tuxolifelawerakesiveba.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/10161815108.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137293916cf8---mekegenafaxasisifad.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/19513048359.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/vomikinefa.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/69663605615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+zip+a+file+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_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 10460 bytes
SHA-256: 82903e76140a0f75e90e3002f68fb04c0af4c3731991f4de99555e77d7543472
font_01_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 17388 bytes
SHA-256: 786c3a566323e839f1b8e9121eea67ce60ed0a954ae65d828a4353e9d9a079c0

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