Malicious PDF — malware analysis report

Static analysis result for SHA-256 af30e7d375fd6ea8…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 11:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce8884c7a20493d88eb0e0bef85c6f17 SHA-1: b93d6e1b8968cf4059710a36cb87e652d7c343a1 SHA-256: af30e7d375fd6ea899110a4be7a502d20259a98620b8f26f8cceca79b679d4d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to a series of external URLs, forming a link farm, which is often used for phishing or to host further malicious content.

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 http://marinda.ru/pics/images/file/xoxobu.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/311ba757a8c2a0cad81b23a98ef5a0e0/fedabar.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/bijena.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/14805065346.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/fawesurabusowapinazo.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/55464173314.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/bubinevol.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/77889788809.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/80509585079.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/13271445596.pdfIn PDF document text
    • http://chamdure.com/DATA/files/wixitukuzo.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/1999125124.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/lokuratulek.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/86575793732.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/44502486934.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/jutetir.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147d969f11d3---21196512004.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/seresebogunagotumorur.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/24403910804.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/kusogowuzor.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/kezutekupiginatezak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+mobile+without+camera+price+in+pakistanPDF 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_off0000ab8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB8A 16244 bytes
SHA-256: bc3db2d5c79efadb800a2945f5574c0709a2f20cd7b69449327b83becba650b8
font_01_sfnt_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 11176 bytes
SHA-256: 2d10108fb346b58ef51b38279a826adfe3e5a820c6ac3c40d435a0e6e2989405

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