Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0df27aa98e6dfd2…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 22:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df6f560ca5a45a21fc73aace9b32d2e2 SHA-1: 08ed8854a870b2002395995b7c5089b5ce06fa31 SHA-256: f0df27aa98e6dfd21816879054f888cbf21b4ae330e89cbc85fd946763393827
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document is designed to trick users into downloading a password-protected archive, likely to bypass security filters. The presence of numerous disposable URLs, many pointing to PDF files, suggests a link farm designed to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://lagrupacio.cat/file/28006299222.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614091951bfd3---gotavuxuxulubuwasabeg.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210917_170541.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631303471.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/sazejufelerori.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/bikezibokupenibufa.pdfIn PDF document text
    • http://onlinevay.com/upload/files/suteru.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161339a0a00f5d---kejalubilazedokilin.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/xonibojivawufo.pdfIn PDF document text
    • https://durimawar.com/contents/files/semuzalewinomaz.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/93531166858.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/34579004700.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/detibatalawux.pdfIn PDF document text
    • http://cataga.de/beta/files/file/gasurefuxujedidopim.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/42525712557.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/45940857651.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/36457985709.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/11279912584.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/27835197296.pdfIn PDF document text
    • https://vendax.ro/files/file/92766808358.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/dibirif.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/5178543245.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/36988465574.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/wupazezer.pdfIn PDF document text
    • http://w-mill.jp/images/file/kexapovisuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=compress+zip+file+androidPDF 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_off0000ca5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5C 17596 bytes
SHA-256: c16ab053e811dfdf26f9364744f8cbb06ce52b2e393c4914287e5b3ec237ad0e
font_01_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 10652 bytes
SHA-256: a8e05aa2fde9bb0b8e77e6e7046694301ee7ff0d2d252dee4d3358f1c9f9dede
font_02_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1