Malicious PDF — malware analysis report

Static analysis result for SHA-256 500c0406c4721fdf…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 14:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 95db93e6a1390ede9be8d2279322f013 SHA-1: c3beb9ac9fc46fe2b72dde010690e6ee35d04db7 SHA-256: 500c0406c4721fdf9c069c4afd90037a2c6f4a12e369ee13b6db09fdff9e0955
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous other PDF files. The presence of multiple distinct, potentially disposable domains hosting these files suggests an attempt to distribute malicious content or conduct phishing operations. The 'SE_URGENCY_LURE' heuristic, while low-signal on its own, supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://creaorganization.com/depo/sayfaresim/file/77474853901.pdf In PDF document text
    • https://webtechnocrats.com/upload/file/xirozidelosalam.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/96517370849.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/86519574959.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/vexodekamolujijosudivob.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/87900481483.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/19856486364.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613699ce564e6---17898750465.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109052333568938.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/87466713691.pdfIn PDF document text
    • http://grabnerestriche.at/guwaz.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210908_075325_101.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/nirenuforudogelukibo.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///guwogojifabo.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/71010029882.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/mipere.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/78241026846.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/poziliw.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/tuxuwavus.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/rakabo.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/petitozadowovutedoreji.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/muxebapavurabuximikus.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/sogejisukezorukapo.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/27085193745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=geotechnical+engineering+1+vtu+notes+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_off0000cfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA4 17752 bytes
SHA-256: 6e6a3222085c3ca6d9a6b7df644b8b8cb42e968617923a29d439ef648e100b5a
font_01_sfnt_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 11156 bytes
SHA-256: 91ecb6ae5b7555bbd703858e7c0c9824a2843a1f63686c43663f4e84533c6812
font_02_sfnt_off0001172b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1