Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac239f283fb3e80…

MALICIOUS

PDF

62.3 KB Created: 2021-09-27 08:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e06adf23a67ea52b02bc9cdb6c6119be SHA-1: 4d48da226d0105b31ebc35c858d39ebbf0863355 SHA-256: 4ac239f283fb3e802cdeee4a5e397c51dec892d98e34ca65927ddd89f4bda12d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan, indicating malicious intent. It functions as a link farm with numerous external URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs point towards an attempt to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2662

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://queure.ru/uplcv?utm_term=dynamic+app+icon+android PDF link annotation
    • https://media-get.ru/userfiles/files/sodusuzinoxanidonur.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/50155545789.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/kivunikofetiwud.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/41135216856.pdfIn PDF document text
    • https://phr4u.com/files/37895220698.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/22070189713.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/mavikake.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/numasugox.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/labazuxokamonetijumatu.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/96567480646.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/jajitewatasenolatarezot.pdfIn PDF document text
    • https://legacytwirlers.cornerfamily.com/userfiles/files/21395786268.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/96508301308.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/2094931833.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/26577186068.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/16764762311.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210923032134.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/14663145642.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/forotodoripize.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fcf0184e7---rijojokupipuwaxigafi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/30d273f2f05cca7f6f36e7e463131732/36136033250.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/balimuwaxev.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/19108956938.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/safifawoxijusunefaviri.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/wigafikij.pdfIn PDF document text
    • http://inica.org/files/file///nixawonup.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB306 15012 bytes
SHA-256: 7606810199436d5dd29578f65a6a2f29b345148127aa85f999748d82bdea73ff
font_01_sfnt_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 10344 bytes
SHA-256: 733a9ad3eceb30f573cd4c9ccfcf18a0035476043ce829b16499d36ea709b9e1

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