Malicious PDF — malware analysis report

Static analysis result for SHA-256 1097d2a6c3289d4a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 21:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf868bd3e1203602737e78026f0a086b SHA-1: ece8c07780c39838fed70c4b761d2d365b6cfd04 SHA-256: 1097d2a6c3289d4a99f844b48e19708178b22729a53394e0a7eced6143518381
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The PDF structure and the presence of external URIs suggest an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://synerhu.ru/uplcv?utm_term=migrate+telegram+to+new+phone PDF link annotation
    • http://ohdiabo.net/images/ckeditor/files/sogiwunapipuvesovo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7d45ccac---zusere.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/wezipotof.pdfIn PDF document text
    • http://4rrecycle.com/files/file/liledik.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109140209447961.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/lefezo.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210903_222602.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/77798740096.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/23590237032.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/gopati.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/17485051337.pdfIn PDF document text
    • http://vswet.ru/f/vaniro.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f407d6d3---jisixevuturiwezizu.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/susiwilorowaxose.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/fibozuvisore.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_off0000cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 10612 bytes
SHA-256: f90114a1f7b4296ff7c858cdfde76754154b16f8d5fd5440c3b60f40b966b035
font_01_sfnt_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 17940 bytes
SHA-256: cbcc43fefe88d7d68e6168008fa5ec147c136a5cf76b501840fafb3688c32706
font_02_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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