Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2950cc511d4be41…

MALICIOUS

PDF

86.3 KB Created: 2021-10-06 19:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65227d6f33820483f31d38381046d160 SHA-1: 95550767d7e1c0e3a3681f14c0036c364a3dbeda SHA-256: c2950cc511d4be41f55b8300b4588562ca0b3e7fa56b1d8a5bc6191e5b9ab964
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to deliver malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to funnel traffic to potentially disposable hosting. No scripts were extracted, but the presence of external URIs and the overall structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=matched+pdf+free+download PDF link annotation
    • http://teplospectr.ru/images/files/38674146097.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/22416838440.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/17384822682.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434694ce6e2---neboxiboravuvejazigo.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/molobozuzinimasodaze.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/37562991224.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/91852897635.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/44129150345.pdfIn PDF document text
    • https://laps.pl/userfiles/file/43772210854.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/52472156088.pdfIn PDF document text
    • http://cutskytools.com/d/files/98345364080.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/69333610883.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/29754798949.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/86228105542.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/60916473469.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/46913891325.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/53629592032.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/busologuwesap.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/75447398470.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630763593_1.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/54663377433.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/zedaxoragabu.pdfIn PDF document text
    • 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_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 10536 bytes
SHA-256: 5940e94b72592c5cf34313a90ffe53a2110d29ff02543817b05ffc0ca371b84e
font_01_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 19780 bytes
SHA-256: b240be8f7c72549d9ca33dea42bbf423cd21f17e70c2078dfb54ac2bf40127be

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