Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb4552563cf3952…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 21:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: df471ac6ad0a1ada92714b513a106b04 SHA-1: 24ad886756b0e2ee4525d4d2da9fb56845bd4b20 SHA-256: feb4552563cf395254c644b3cc2c3aed3044a6f31f84bb59e3669e548b41baf8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links on disposable hosting, suggesting an attempt to obscure the true destination or spread malicious content across many sites. While no scripts were explicitly extracted, the nature of the embedded links and the ML detection suggest it's designed to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://zvaracskaskola.eu/editor_uploads/system/files/rosux.pdf In PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/25948865197.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/41622625788.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/sofalaje.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/32188903088.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/jaligisa.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/vezafejen.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/fusakak.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210911_013108.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/68008539044.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/tetoveruxajonilolalavi.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/gusuvituz.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/d182767aaaab0966e711770700a44b9f/66820720471.pdfIn PDF document text
    • http://benly-carson.com/product/files/13788131149.pdfIn PDF document text
    • http://rsentco.com/upload/file/tapawu.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/700845922.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109132107488903.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/zizegi.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/nuniradirarezitaxowaxex.pdfIn PDF document text
    • http://mobitransjogja.com/files/35944514359.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/rafuropogofetetegeravi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+look+through+someone+private+instagramPDF 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_off0000d317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD317 17188 bytes
SHA-256: 23b3fd66b80edcd0f943417bee0cc98dbcf9e02e180e44a3b65f2b1e2be3a208
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 11036 bytes
SHA-256: f8d070fe99ce53471bd75eb089fd8947176bfac23de682e657ed21a62ef392f8
font_02_sfnt_off000118a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1