Malicious PDF — malware analysis report

Static analysis result for SHA-256 186d47e434d6cdb9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 04:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d13989543f96b4c361323621fa545d3 SHA-1: 9e9507849ea046c8f690f8c2cf31be391df1c223 SHA-256: 186d47e434d6cdb9a26e3bdd743244651fe4a136236535f7df958bb0f8aebb22
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to PDF files on disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://perfecthospital.org/ckfinder/userfiles/files/21892401519.pdf In PDF document text
    • http://cascinamana.it/userfiles/file/55327711054.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/pepegupo.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/nedoxuwegugixerum.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/dojadozimidog.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/xituwuvozugugipufafonov.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/japamel.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/vulugabomubipirukajek.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/nomubovavitewojujetomi.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/natigirog.pdfIn PDF document text
    • https://shidoremicrosys.com/media/24407293221.pdfIn PDF document text
    • https://drlanda.hu/user/file/wokej.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/69109515870.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/gusoputubogunuwufib.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/20784257755.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/79733595418.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/55c40vu3uhbb8ao1f57j98qomk/27241884143.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/gozuverosakadubinatiketu.pdfIn PDF document text
    • http://djpress.pl/Image/files/98134233689.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/7204937136.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/3318579006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fifty+shades+darker+full+movie+eng+subPDF 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_off0000ac4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4C 16460 bytes
SHA-256: dedf036254ed5f34a2b09dee22d9ff793b032d4fd5065b07fc4504ce6d119ce9
font_01_sfnt_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 11292 bytes
SHA-256: dfd7efae98d794e8d56acb80db242900185bda7685d55312c1f47c375de4dfeb

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