Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72fbc3146fa39f1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 12:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad3fb7c14c8ab175ec64b02fa7e6ace5 SHA-1: 42438ab744f13234a3d7c8f13d0d712a19b75cbf SHA-256: b72fbc3146fa39f1ec966d147d1971edf115f5ed94ddc632835bf31793e2065f
206 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates a pattern commonly used in business email compromise attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://philabc.ru/uplcv?utm_term=free+minecraft+account+mac PDF link annotation
    • http://dagmare.de/userfiles/file/jowanerefabom.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/wuwotava.pdfIn PDF document text
    • http://chikatere.com/Upload/files/99258033068.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/76548077380.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/gemomeduxo.pdfIn PDF document text
    • http://chinese-wall.tw/upload/files/vobika.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/42383099396.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612f40c7cf64b---garumidadogarofekub.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/riruvinejojaw.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/fajub.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/71339169213.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/46438710294.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/84993996391.pdfIn PDF document text
    • http://rc-modeller.se/images/file///kezoduxezomogude.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/walotoxugobejanedi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2e69f0e02f0f8b3aaf0cca40d415a158/9844021006.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/85686164538.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/sefamarigimagaw.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/nirugizisotebejibil.pdfIn PDF document text
    • https://ultralloy.net/upload/files/50916390287.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/47468141794.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/11828017040.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/sesupalafuwomuku.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/67311655885.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/mutowuluwuna.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/fivobuzu.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_off0000d8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E6 18868 bytes
SHA-256: dd5a628f7050e08845cddf9b0abc0db734560fdfc2cf53e9f7482edd743ffcc6
font_01_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FE 10360 bytes
SHA-256: 7dcd2ee639697b30020d9a8f47a71b3374a5f45653f01da17e5457b55ed6d4b7