Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e0488c0af94263…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 21:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 454a89c15896097636dfed99966f9627 SHA-1: 7df25e24c0d717a452f63a71b81b81b79390e64c SHA-256: c2e0488c0af94263af51c320c31a3ed3b70e0d58804fcbb50fcc57041fb1f68f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The PDF contains numerous embedded URLs, with a high concentration of links on disposable hosting, characteristic of a link farm designed to redirect users to potentially harmful sites. No scripts were extracted, but the structure and URL patterns strongly suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mumegram.com/userfiles/file/81458305258.pdf In PDF document text
    • http://drivingschool-brno.eu/files/61397946723.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/98031887060.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/34112343719.pdfIn PDF document text
    • https://camelcarpet.org/d/files/45420525032.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/39145974971.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/46904587755.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/62948911558.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/82053478156.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/botepikovemuduforijutukuk.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e5ee7d6e4---zogizifuregub.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-4/20210904083348840075.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/71235212307.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/60702777139.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a971ece5---29390848585.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/wijadavepefenufuwiser.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/rudibemaxigevebuva.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/dafudebarizijusu.pdfIn PDF document text
    • https://reha.bg/content/upload/file/61702212981.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/44994621220.pdfIn PDF document text
    • https://kaimano.it/file/21554726176.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/malikuzulejadozivanefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+clean+up+phone+storagePDF 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_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 18464 bytes
SHA-256: 41a9cdd5e07b0cec4faafba2bfe6656378cc93a1daa4176f3e319c3dff7cf4bb
font_01_sfnt_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 10736 bytes
SHA-256: a6d484a907416d772ea455f309be08f45a4dd6dbf959e5524c5827235df22a0d
font_02_sfnt_off000129ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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