Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcb4c29c5ebb8e6…

MALICIOUS

PDF

69.4 KB Created: 2021-09-11 07:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b1fac0df4ddfe4f5ba5be809173824b0 SHA-1: a1cfd3a07d9d33fef424081a00c54e349e22db39 SHA-256: 8fcb4c29c5ebb8e60836c4579d1276a3bfef06b0c18130d4e79b0fba27d7f970
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to host malicious content or redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The presence of external URIs and the link farm heuristic point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16137e874eb8de---wuvovadiwibuxogevomon.pdf In PDF document text
    • https://finliz.lt/i/File/kojaxekokokuvam.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/74629652433.pdfIn PDF document text
    • http://hkwwta.org/userfiles/79496822929.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/begepuluru.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/ravanowisiwoduja.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/xifojobazorofevemuvi.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/4995755925.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/93034703843.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/308023348.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/mugerebuxonawegajebaralox.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/dulido.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/92037501715.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/2812143357.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/14414334692.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/22087521562.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/7204989391.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/13238310848.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/diruwuvix.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/basigilanuva.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373d1dafaee---79708049069.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/14731636016.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/23360876711.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/33614060365.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/nokuwumenafaseja.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/8098969504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=odex+vs+deodexPDF 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_off0000b3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AC 9832 bytes
SHA-256: abad5d54f054a9cc0339d33580be3d234ffda0b3ba6a59a0812a13c96ba385ab
font_01_sfnt_off0000c965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 15380 bytes
SHA-256: b3bebaecd25e83f6eed3b72cace232b2b5f683c13e01c875fef9937d5bbe0b5f