Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdef8677c6783d16…

MALICIOUS

PDF

80.0 KB Created: 2021-10-04 13:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 7397224dd01265782e9b8f7e5277393a SHA-1: 6d3fe75bdcc27915e5610e9dfd413bc59574f3cf SHA-256: cdef8677c6783d16f300a07f71beef6a5dd70f63154e6b474cfc4921267ca463
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or used for hosting further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the PDF as a link farm on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=how+to+make+frequency+distribution+table PDF link annotation
    • http://ktcz.eu/files/files/nalewun.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/36941378332.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/35327486201.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/mirisopud.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/nakupalobi.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/29378244115.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/39627793615.pdfIn PDF document text
    • https://mcsfood.com/images/file/ponawilutasugoruwis.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/madaduxugawobafovakuse.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/jisutiluxad.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/sixujeteganuxosenuruzu.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/5036417808.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/jemeligakafuzarabobipunaf.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/samital.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae66bb56e4---pifofaku.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea54016c50---53491853694.pdfIn PDF document text
    • http://cy2hand.com/userfiles/64561046085.pdfIn PDF document text
    • http://101balkon.ru/upload/files/gezegonaderodokes.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/jomivaliwugaw.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/86998307727.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_off0000d2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 17452 bytes
SHA-256: 532d1a2ac5eab431a97ed39e2dde90fa6c3dc4719fb9f66dfe1109ef94176d3b
font_01_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 11308 bytes
SHA-256: dcbe0abf54dfc39fbd1b30c6e79a09256b6ec1a7a02bc1cb8e26d417ed97014c
font_02_sfnt_off00011a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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