Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18431b60d37d794…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 03:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9f7fb81efe95f30977d0ee08f0a3396 SHA-1: 45dcf445271b0bd204ceac7e70c64b93289a748b SHA-256: d18431b60d37d794b740c66fe0de1ee2ba53c67c5cd7e886b38c486d7025ad94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to redirect users through a series of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://tlkingatlan.hu/kepek/other/file/zikowujarafofirevamowi.pdf In PDF document text
    • https://chingchia.com/uploads/files/202109060236381999.pdfIn PDF document text
    • http://imi.vc/upload/files/zebolib.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/sunivojugolererumexezovix.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/jarufiraririjifubutonegas.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/roxemuzo.pdfIn PDF document text
    • http://polipack.ru/content/file/65396658943.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/7895300919.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137291239e51---powusopadavasagubipaw.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/26754339108.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/sunavidixitovogunije.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/7672780785.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614102e8812ed---36386905924.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/lubalebediki.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/rosematizajewe.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/18077648608.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/natusitoxibuwiwusigos.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/jezesizorotapujubewu.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/99907041290.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/49885401773.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/90ec3f5760c918cd25374e5bf4b2d20b/97792076043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=famous+english+short+stories+pdf+with+picturesPDF 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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 11228 bytes
SHA-256: a229e8877f58778e669e6a407274b7cf5fee2dabd6a5fdba23908876960d6080
font_02_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 16808 bytes
SHA-256: 21a84afef12f9527490d69155fa4246815af692c9e1a22ff183c3f41c11fa8fc

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