Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c185c330731541…

MALICIOUS

PDF

72.5 KB Created: 2021-09-07 06:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fad324cbf40067180a1948f7a423d6e1 SHA-1: ee8e41aa456df605fad9493658481dc01fb74943 SHA-256: 97c185c330731541ce2964e8c3e1962d0f53077b99db8ebefa4bd73871e30521
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for distributing malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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=sdl+trados+studio+user+manual PDF link annotation
    • http://pincailight.com/zk/UploadFile/file/2021073001104573499.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/79413407908.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/razaterojigox.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/rufevogavimegolaf.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/94957996895.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/manivosusebow.pdfIn PDF document text
    • http://faradbox.pl/files/file/xomenogekak.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712f2628bc3---75694238863.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/pinaxoloz.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16136955a71a04---32721037652.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/13276389003.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/wimorakejopunavimusu.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/gupesomidisujuz.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/46950589849.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/kilizogezumapi.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/figowovozajedido.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/74485711581.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/20597916369.pdfIn PDF document text
    • http://gyobel.it/public/file/togipukufapabefif.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210713051157.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/zibutifuwo.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_off0000b855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB855 16892 bytes
SHA-256: f7c72a49b020f6597de1c0631e837d827e9182d9bcf4e4929ee65acd6e518770
font_01_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 10584 bytes
SHA-256: cec68a6f5715b95b7e9c176e1cc7ec1f88b5f134457a62ab911cfe4a0cccd010