Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e67a48fb381727…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 05:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03b6aad5b1b96d9c74d8bc85ed8e5c8e SHA-1: d921d62b3634d1ee9455da832c87c14b6fce57ae SHA-256: 17e67a48fb3817276871b2ecc2ac29be992620822511debc34440e35b03c71e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful external sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://neonatal-surgery.ru/userfiles/files/vepenewikuwiw.pdf In PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210910_59F251F7B96A25AF.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/38190065604.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/99886319700.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/xoduvufilebaf.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/87470825517.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/28407723596.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132954d2c716---50574163791.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/dukuwupuram.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/laxipubanumebofewok.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7634eac140f5e0d68328c6ac3cc4fc16/4281229387.pdfIn PDF document text
    • http://baove24h.info/upload/files/jozizoveka.pdfIn PDF document text
    • http://origo.ws/userfiles/file/kewoxipaxezuxedojaronajo.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/zeratolapemarunetajurir.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/24559966116.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/sudesuzewurid.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/63026198616.pdfIn PDF document text
    • http://oris-am.com/editor_up/jaxituzomeva.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/9669764342.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/lapafofivobefarerotum.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/84042126574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=excel+if+function+exercises+pdfPDF 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_off0000b2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B0 15816 bytes
SHA-256: c6fa045ae2a3ac8b82a8c626ff480131b8cd6c24dfa0f28d3c1d6c7d89ccc644
font_01_sfnt_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 10636 bytes
SHA-256: 21f8a104e21e97d108e72e01c424b1a953fe332119c41470fb71ed075f1e3c3e
font_02_sfnt_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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