Malicious PDF — malware analysis report

Static analysis result for SHA-256 d976cc7a8f10752d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 15:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c35fd5d22dd444d72de110806d770e0 SHA-1: 70bcf24603a8b95d798e93bb3853de28542051b0 SHA-256: d976cc7a8f10752d69b193ef3f2ba265dd2ad1e1876cf77185730b50fd537225
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript suggests an attempt to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=learning+javascript+data+structures+and+algorithms+3rd+edition+pdf PDF link annotation
    • http://maxidmum.com/images/upload/fck/file/tejavul.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/lofimid.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/wurufamevetuwobes.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/53828968895.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/99706557965.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/vowevimupor.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/dulalijalufif.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/razevezurobuvobor.pdfIn PDF document text
    • http://fluorescent-training.com/file/burubuzimujigip.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/xuliv.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa6e27258---4365951569.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613939e908761---74584376946.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zakufomipezesusujusagave.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/99306685592.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/34296762979.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/mekukunubidaripe.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-12/20210912223600509731.pdfIn PDF document text
    • http://fteq.ru/files/file/6046019149.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/koririw.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/romuxigejixubovaxijifir.pdfIn PDF document text
    • https://rais.bg/uploads/file/95556385778.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/7890444187.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_off0000be5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 11492 bytes
SHA-256: 867dbcbad06eb9553d89fdc721660f110c275d86b37610c5e07d0cb3eb31c19c
font_02_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 18740 bytes
SHA-256: 2dd1b2ea2ad9d0b1c19ae88337d7eb3cfc9077971e1ad2a49327a443069f1e72

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