Malicious PDF — malware analysis report

Static analysis result for SHA-256 7274b4c64eee6d37…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 20:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f13df4d9d2e4b31767046e569d207d4d SHA-1: 10e57c75ee1b6870ddc19b1d2f26cfe4c47b1906 SHA-256: 7274b4c64eee6d376eb8e8b7174b0ad9b5c204e7fda0010ec112233411b5b2ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains designed to host PDF files, indicative of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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
  • 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://bdata.vn/upload/files/kanilajulomijexa.pdf In PDF document text
    • https://globalcircle.club/userfiles/file/11340651233.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/xovemetuti.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/62233909726.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/nadulabokujagotolufukoz.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/keloxamogijisowuj.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/87950271369.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/mopazogam.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/bdf2hufrurs95vn1st961ts144/57109218123.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161449498b8710---62571771715.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109121551062759.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/wijapavot.pdfIn PDF document text
    • http://chayka-svg.ru/files/40014560776.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/nipon.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/59865511087.pdfIn PDF document text
    • https://krossi.ru/images/content/files/55270599012.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/55045936337.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/bozuradenotij.pdfIn PDF document text
    • https://suncables.co/images/file/17970226730.pdfIn PDF document text
    • http://vodova51-53.cz/files/jopuwurizodigeperobapig.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/20280571715.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88043997254.pdfIn PDF document text
    • http://pjteam.hu/uploads/nufonesinemexixola.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/21673140813.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/80021589124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=moorabbin+aviation+museumPDF 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_off0000b423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB423 10520 bytes
SHA-256: ad0b52f16eb359e177c56b1ec65afdf35725a6ff87c936f6820fa0ec977e5707
font_01_sfnt_off0000cc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 18192 bytes
SHA-256: 597fe3dcc31741e50cff0c617c4ee40dd6846908da0ea74987c00fb583ac9ad8
font_02_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1