Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15385de38aa0efd…

MALICIOUS

PDF

67.7 KB Created: 2021-10-13 14:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ad9c344c2ea797bad2c6fba1bef88ae8 SHA-1: c563c4b82b69643bb612b88b9b4684fc9580ee41 SHA-256: d15385de38aa0efdea0e4cbd2d8fb454f77ff878545f726c8d73f208ab8ed669
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files on potentially disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://getdol.com/page_data/file/23874476564.pdf In PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/latinadinetebilorana.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/61656062581.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/67238627346.pdfIn PDF document text
    • https://hirurgija.me/files/26297978740.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/39158468667.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/sewedirupaf.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/pavad.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ti5qonu7bd42cehh9dm4hbeibl/63179679440.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/dilomobebupokoviw.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/supukepimilemegeko.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/tedavufawikod.pdfIn PDF document text
    • https://ambalatender.com/upload/files/62979046495.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/75715420898.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/6963939918.pdfIn PDF document text
    • http://cresapumc.org/files/file/wipil.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/xewepinutipafe.pdfIn PDF document text
    • http://recviem.ru/img/upload/febazate.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/pazolu.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/wiverexutobipir.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161324956565a6---mirifofuzeno.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/35031705993.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TSvcnjQ06Jg/uplcv?utm_term=hex+to+pdfPDF 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_off0000ae9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9C 14916 bytes
SHA-256: b4f0be954bb347ccc482966617ac8dd2707a19ff936a573202a7980aaf64e96a
font_01_sfnt_off0000d41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 9912 bytes
SHA-256: 4e5c72fff1a4a94fd12234d237c1240ae5e4e0d632413b3dce583708fe1e0424

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