Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d790507fa4181e7…

MALICIOUS

PDF

97.6 KB Created: 2021-09-10 11:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4b8066c03f43c7e3b105bf6d809a81f SHA-1: 8213f515f1a0cab85debf6e3ec05336f3d8fb76f SHA-256: 9d790507fa4181e794829b933accb8998275b38e88d737167b1559b9e8770621
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to PDF files on potentially disposable hosting, indicating a link farm or phishing attempt. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://megatex.ua/images/uploads/file/25389940992.pdf In PDF document text
    • http://marta-galan.com/files/varios/file/dexixologezif.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/554353012.pdfIn PDF document text
    • https://labelmarket.pl/data/file/87987185495.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/xivagepovonex.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/39054817727.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/balasujamagexadako.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/xuxibamovebura.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/24663420365.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/52304659403.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/21595687659.pdfIn PDF document text
    • http://195exim.com/datas/files/lunuku.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/wadipudaxinebogawopuvadiv.pdfIn PDF document text
    • http://ge-mak.com/files/kebajo.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/47892381736.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/52869587001.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345c888aea0---kuzobedipanelivajo.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/17234653733.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/bowumuzetodolomo.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/rozetafa.pdfIn PDF document text
    • http://davcpundri.com/css/file/tosarobozuriledidaro.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/sepimik.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28578726672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=t95+tv+box+firmwarePDF 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_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 19808 bytes
SHA-256: 959fc5f77fee335f79f2ee224afe77164a99fa7f549d017b8ecf32cf3b49ea71
font_01_sfnt_off000147f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16008 10716 bytes
SHA-256: 718ba4e560930872b5b6a3179a870939fa207ac61adfe00c9e45293d9e7f1802

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