Malicious PDF — malware analysis report

Static analysis result for SHA-256 10990a6c0b23ec3e…

MALICIOUS

PDF

78.4 KB Created: 2021-09-22 16:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27cd8eabbababbc19ed64c0f9d74bb68 SHA-1: 393749903c7272bbe3b738d50df72f0b1573d4b3 SHA-256: 10990a6c0b23ec3e3a7ba501560f23f5dfbd6cee66470c4eb95151233e696dde
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=r+words+in+english PDF link annotation
    • http://hanasushi6.com/uploads/files/92040240197.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/favex.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/37624716137.pdfIn PDF document text
    • https://bak.vn/upload/files/vitimej.pdfIn PDF document text
    • https://citytrafik.nu/images/file/99386932982.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/58707444317.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/mnfl2n17nuf5bm4rc8a5nqk1na/69809382868.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/76861908654.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/68691204168.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/faxokarofax.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/81379769346.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/lojilirobovilomugodumubuz.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff279ee9c---zulur.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/95806984071.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/18299184116.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/bedifonowududuno.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/87764307233.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/59495629641.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-07-18-46-17-36.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/xakodenazafudo.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/rulux.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/rakusotut.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_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 16004 bytes
SHA-256: cde49e969d2f97ab7eb240ce3ed36038be1d14b1f9527879b3022eb47f1c8a92
font_01_sfnt_off0000fd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 10400 bytes
SHA-256: 0ff49cd6c8ab74b77d206f22d49b51551d8a9c453864c1b8345ff4093cfe65ff
font_02_sfnt_off000114c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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