Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4bce60cb3545aa…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 12:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00301a9d371e5a4a51a66df1800ff877 SHA-1: aa7cac74a6f721adacd420d70798a2fdc7b5992c SHA-256: 2f4bce60cb3545aa58d2a46de63ae279814a23d5d21c927b1d16746de8929d6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with many pointing to potentially disposable hosting, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for initial access via spearphishing attachments, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://simkoongschool.com/uploads/editer/files/64654906789.pdf In PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/10302083362.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/93334007609.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/98082804453.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/698016989.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/47407215833.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/72565249249.pdfIn PDF document text
    • http://olympusflights.com/files/files/setilositumufideban.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109270012311473.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/42882159212.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109170612112116.pdfIn PDF document text
    • http://generaldistco.com/images/file/nemuveku.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/tabodobidixixek.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/zuwenosep.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161393a5865e65---dakosarewejulamudabujaret.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/59674161569.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/55264948395.pdfIn PDF document text
    • http://chieucoingason.vn/files/41486841067.pdfIn PDF document text
    • http://ailizia.com/userfiles/86138329312.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/temopobizu.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///22750073431.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/setuwuk.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/40785148754.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/39857633250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=vortex+cloud+mod+apkPDF 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_off0000b1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D4 15240 bytes
SHA-256: cd7c5a5f3a72163fb3b29f96741716784688e3f8ea8e5352d88c352287097eba
font_01_sfnt_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 10576 bytes
SHA-256: d9d79e692b5b714005445e1099c44be512fb4a7cc83e5c3275984d989c2ab8aa

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