Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c199aff7b5211b6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 06:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f2deb98dad5cd20282d3e116744b5001 SHA-1: 52b838fc75085c00aa9af6afedffa71d88e9284f SHA-256: 6c199aff7b5211b690a09efb26ef0967169d1cd6bc861f80a980ab3a94f6df88
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on suspicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • 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 https://medgal.pl/admin/ckfinder/userfiles/files/49136780480.pdf In PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/somaxesolewija.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/xisakekidete.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090210295162615.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/8589124473.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/beduritavizimomatuxeziri.pdfIn PDF document text
    • http://rts-3.ru/upload/files/38454938774.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/28513781404.pdfIn PDF document text
    • https://blugarden.eu/file/14192623522.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/34459551438.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/63638147774.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/somozasopokaram.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631935469.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03461490a---degifokeroketabuwuteto.pdfIn PDF document text
    • http://zenithmetals.com/files/13049068521.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/2078775534.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/8724745967.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/16038390032.pdfIn PDF document text
    • https://5uempat.com/contents/files/fekokajif.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///71053709090.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/kegefi.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/49025971612.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/36543860861.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/57400558700.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/886def9457d485b48caf9693d37a1e0a/fiwojareribaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=toffee+tv+app+free+downloadPDF 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_off0000b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 10344 bytes
SHA-256: 82bfc7b193573fdfa9077ed2db3742df98410f2f5180349eef8e2a2f2100746d
font_02_sfnt_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 17020 bytes
SHA-256: 49f0f7b5e770117af5700b739011c50c31e7d1aae355e00ed16f4c293577f287