Malicious PDF — malware analysis report

Static analysis result for SHA-256 d528260f88efa4ce…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 08:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0f6b2e8145e6a55299928c7f7508c42 SHA-1: 2b65aa727d78050cbf110c7c5c84490ad7a7fa16 SHA-256: d528260f88efa4ce7ed00e045355c285da6cac61b95cf769054b2edb45536188
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the primary purpose is to redirect users to potentially malicious sites for phishing or malware distribution. The embedded JavaScript likely facilitates this redirection or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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 https://garglob.ru/uplcv?utm_term=super+mario+apk+free+download PDF link annotation
    • http://sprinter-lab.ru/content/File/93183972873.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/direna.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/wujawukobewavevitizavebe.pdfIn PDF document text
    • http://theponghop.com/upload/files/wepelogejakudakureg.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/dapopaxikazitepozad.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/nipotewelabega.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613581b4f0972---femitiv.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109051416009993.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/66943225972.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/mosotepane.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/95ce6fb2fbd2520102a25b226b7ced49/jofinozavepulezurobek.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/41675019827.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/dokorokukubo.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/bopinovolemoborinulolo.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/98650308758.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/38557116706.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/29276569161.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/32170803397.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/wodidu.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/66688640594.pdfIn PDF document text
    • 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_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 10744 bytes
SHA-256: c58253ac4165a179f110ed0295950f00620616dcde23a478a4616209aaf2cb77
font_02_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 17988 bytes
SHA-256: 86825e0ad89535f3b6dd8bd42b37f271e62ef87b4b9fe17b9c4720e5aab4c186

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