Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea670bc5855edf2a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-11 09:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e75e2bc6fbf03c5777a8f1228b13963 SHA-1: cb4fb262e7d14b13b9423a6926bad90faf10df38 SHA-256: ea670bc5855edf2a2c08ee631c7e5c3cee4c4006a26e0ba75aec03cda3c7303f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, and multiple unknown URLs were extracted, suggesting a distribution or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maekalocal.com/Maeka/UserFiles/File/5483621209.pdf In PDF document text
    • http://elitaliaweb.it/upload/file/fojuxuseki.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f148d0ba8---zudukovubelimowubu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b137316be---85563960241.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/45048059882.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/76498440044.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/11194858533.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/nalofisad.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210902_F80C8F923B5B6D0C.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/vulorenuxugepu.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/mezazorarupuza.pdfIn PDF document text
    • http://gerocuki.hu/user/file/soratanate.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/zovarisisomu.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83234708482.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/movevumavisov.pdfIn PDF document text
    • https://thepainter.asia/upload/files/desatakilazujilunajo.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/8835190092.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/bugeliti.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/36063052714.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/25986267924.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/9604911659.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/labetonukofo.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/xemusixefoxugututi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gta+v+online+god+mode+ps4PDF 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_off0000bd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 18068 bytes
SHA-256: 5d490942971a94df659c2efe200612053a173ad6b286531551905be5e9531532
font_02_sfnt_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 10816 bytes
SHA-256: 7caf0dd8fa2a7c6cc73544cf0621414b7f7b5812279fc8764afb305865517877