Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fb9346d58d8b12…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 01:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87dcebdf0eef9d2ade3a9c5e4a443528 SHA-1: 2eac00bedfb095b9fb2562794f8716c55448033a SHA-256: 97fb9346d58d8b124005481674d32f140f1fff86a666d4bc22aa338b00220fa7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains or are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=android+p+1+minecraft PDF link annotation
    • http://davidhammerstein.org/ckfinder/userfiles/files/bepixe.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/58738442905.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/dazexatolizetubadaxew.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/jaguzubofiwa.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/46532673929.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/fuxekexudufefuxevuripuwak.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/xelabekatowuvapatife.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/10825191114.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b2cb6be38---78522365059.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/sixarazolovawidebok.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/nemotatiwefosuxi.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/sekekojomi.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/mukeb.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed91e74bec---54072283580.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/rurad.pdfIn PDF document text
    • https://value.ae/userfiles/file/nenugixipivazuxalewolazoj.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/10775534823.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/16083108054.pdfIn PDF document text
    • http://bubb.cn/up_file/file/xolatajakajaso.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/nuxifutunidifod.pdfIn PDF document text
    • http://strahyi.ru/images/file/84833035284.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/7311359668.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_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 10600 bytes
SHA-256: 982aa102e1965dcaf66d9e413a2fe5b881d1cb8b8cc22024094c77d4e7ba7dc3
font_01_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 16932 bytes
SHA-256: 06221e8a1fc3b7354e81dfdcb6d8067486548c85640efb35689a20195f2db722

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