Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1ef55e5ab4e514…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 01:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dabc75b8c23a7040232d94a9543cfbf1 SHA-1: 0bc0332cd059728e5f6afd65036b6c695631d562 SHA-256: 9c1ef55e5ab4e5146b0d39240792ab5c285c84c80dd6b81e0745e74144ad58b4
142 Risk Score

Malware Insights

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

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f5da6cc14ad8e533508477888cd2103f/judakidexumakiriponesamo.pdf In PDF document text
    • http://ediljolli.com/userfiles/files/92093853221.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210911_A46B14C0ED23284E.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/zutelarilixalalix.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/43416431244.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/zejadawu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135d79780ecf---vesejuw.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021090316307096555.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/36487294834.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/29335916373.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/rawudifalafovuxutagodi.pdfIn PDF document text
    • https://totounited.com/contents/files/vitusapomafolemibirajefag.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/debunusilorowojuniwipimas.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210902/files/20210902033817.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/87846785341.pdfIn PDF document text
    • http://altus.pl/userfiles/file/50478830910.pdfIn PDF document text
    • http://yibetter.com/data/files/keduvofexejiziwunisipa.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/54675879010.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210911120529668.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/pozefewovizunarunoxuji.pdfIn PDF document text
    • http://dsfly.com/uploads/files/17176830314.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/46045694647.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/mozafebanabumegosirupug.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/91082177211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=watch+intimacy+movie+online+megavideoPDF link annotation
    • 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_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 10720 bytes
SHA-256: 911dd0a010139352c6562ac8c64dd2053dfa07fcb3afd5d3d5d8146a5ef5ed01
font_01_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 18184 bytes
SHA-256: b6c499317b2d116fc0a887761818ba058e414720bbc26c8cc328f1c3ba5addce
font_02_sfnt_off00012162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1