Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4398afe94ab972…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 22:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04e3ab5f11e28e9125fcbc2967295fa7 SHA-1: 0cfdf2fce053ff84f3aef9f2c113c40c46bf5500 SHA-256: ed4398afe94ab9724e87dc9f039e0cb0d703dd1494ac72b452b216ed4bf6ae93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the structure and heuristics point to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://thefertilizerproductionline.com/d/files/80954034432.pdf In PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/rawatijetejagodimajegipe.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gamuwepafuluzebeda.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210912112402189748.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/39272449425.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/90568806079.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/sozigetevo.pdfIn PDF document text
    • http://mgrima.com/files/file/73645084550.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/75764555969.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/wazefigejifi.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/87467070821.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/dimojo.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/11457945252.pdfIn PDF document text
    • http://turnyras.lt/Files/file/51115983705.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/65996006378.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136e57fa11d8---suragetekowaxamatizuludaf.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/63245419597.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/ruzotakubitunaka.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/24990967352.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/67852516917.pdfIn PDF document text
    • https://fishuntpesca.it/file/kewavo.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/76283853879.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/76861095655.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/vadokavodezavabit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=access+phone+data+from+computerPDF 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_off0000b446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB446 17324 bytes
SHA-256: 6e9be074f50d4ceb7cb10688bdf3eecabd6785315060e258e145fb423c909aae
font_01_sfnt_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 10828 bytes
SHA-256: b241057035a77bc3b819ec3751d5bcbf985ab3009b1f6164290a70b90da673e4
font_02_sfnt_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1