Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4de4794f0508077…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 04:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4aed1c7c1d1c067d6acfe47304156001 SHA-1: fb461aab7b3af69409645e14ec665cfd16492c76 SHA-256: c4de4794f0508077343d104679fe47647a62be31b6be082f81e60dcd2fce85cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate that the primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://noithatkuongthinh.com/uploads/files/18574614845.pdf In PDF document text
    • http://chochosanencino.com/uploads/files/riwon.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/17638459513.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/65154798968.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/22033837428.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/narenononilewugali.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/76221732405.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135748596bca---28316728842.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/wozewipomive.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/fajot.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/80169303535.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/26493668381.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/18527246381.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/vuzivuvaxulatupetufum.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/kajakoveloviribiwinewex.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/3610264570.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/12853339025.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/paxijuw.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/56306910117.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bde4c808c---papazofikuworuk.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/21592786579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sword+art+online+subbedPDF 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_off0000d5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 10644 bytes
SHA-256: 9c3b712f9bdaab343e37273950c0f91939f7af8268b40e8828af4c4902cef7b7
font_02_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 18216 bytes
SHA-256: 331e816505089c5cf23ca7c5783a10363982d3d78408db70a1fcd7c023db1f8d

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