Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd93919d224858cd…

MALICIOUS

PDF

85.7 KB Created: 2021-09-23 01:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e15ab06341707659d86f661221b7edb SHA-1: 3873334aff5a9528e9d2e7216f8655e18af7a972 SHA-256: cd93919d224858cd9d148b192fa3fc19958907f403279c11a652107c72544846
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://mamalight.net/business_school/uploads/file/79169073878.pdf In PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/87887896045.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/77084439261.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/12072680850.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/69894946703.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210909_191252.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/34647668412.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/rogimenotobafolobajuvi.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/bexijalatife.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/23260515455.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/23359426803.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/pesusudug.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/veroxolijewaxaluwilikebo.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/lamapojidilevomakatufepof.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/kamixonuxewokivugila.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/gawuvajererax.pdfIn PDF document text
    • http://wdnederland.nl/file/vomaduwipilopedepasag.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091104193473499.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/32647de7c643ce4b5a6b20427e811e28/39818230774.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/xanilajokoxadezujiwip.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/73566995679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=live+indian+tv+channels+software+free+download+for+pc+windows+8PDF 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_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 11036 bytes
SHA-256: 6718936106c9222d307ab7427d4f5dd878c515c10cde5b5ac78cf174537d8231
font_01_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 17632 bytes
SHA-256: 57778f5ff34cd7b7fb52635f4ae03bcecd01000db807b998be2fa6ee1de32e7f

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