Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd46c4109cbcc167…

MALICIOUS

PDF

70.8 KB Created: 2021-09-29 05:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 48b2be81c2090a4be15c1e2741a25f89 SHA-1: 77cb09297480ce90f5184c19662afc51d718d531 SHA-256: fd46c4109cbcc1673051ae98a74d115845dd4b60503b18a840f5301f07f57874
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://chcial.ru/uplcv?utm_term=trailer+peter+rabbit+2 PDF link annotation
    • https://mrdak.cc/uploadfile/files/10106582276.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/60125263059.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b37aa70976---fubemifodedowelaweninadik.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/86853081045.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/5608668153.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/37759647989.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/23626364588.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/700049917.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/81881975923.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/bokugidetamonaxafu.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/71611548618.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/57571901724.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/74708383537.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/10938367613.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/23725633143.pdfIn PDF document text
    • http://lscapital.it/images/file/gusifamibobu.pdfIn PDF document text
    • http://licausi.it/userfiles/files/vudolafonimofelani.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/lorure.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/v268mr036hnn873hvq4kg6fvr0/divazag.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/xubakuzeki.pdfIn PDF document text
    • https://amgaa.org/temp/files/10591874680.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/vowuvewasotonoloxijunisi.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/vezopudurififab.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/jilogejinun.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_off0000b37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8C 17012 bytes
SHA-256: 7cebcc359e6197e9723765e31adfecb4f28512955d91d5e40a8ed294bb28e46b
font_02_sfnt_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 10076 bytes
SHA-256: 1e83354ad1cfcd35af4553040b6f2a02a1a6c07757647732782f200059b9cb2d

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