Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4bc26883433548…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 06:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d35040d88d04ed3358d4a18260eb9420 SHA-1: fbce67f250323ecae3d6a94d1fcbebc11f31262c SHA-256: 5c4bc26883433548e909227c3ae8eea066a1f3b3fa0384a0107484ec1ad47e15
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=cursive+font+for+android PDF link annotation
    • http://strandedtattoo.info/file/fogikediminonapinijer.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/61861865023.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/27755033193.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/76731689313.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/zogonubidowadiwiloluvutik.pdfIn PDF document text
    • http://th-hl.com///upload/files/pewigumeze.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/livomofikigarigamid.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/motijanezetozuxi.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/81102526101.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450ef5e47b2---24725094673.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/bufupibisu.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210912084839.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/napinisoduliwosit.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/gifawunopalakimanomoziv.pdfIn PDF document text
    • http://htygroup.com/upload/files/62439575378.pdfIn PDF document text
    • http://receptlap.hu/files/temujan.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/14731081967.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/62104377702.pdfIn PDF document text
    • http://ellev.fr/upload/files/jubedakotokizoronogigaluw.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/88010500214.pdfIn PDF document text
    • https://ip-pharma.net/data/files/buvokesexisirafiz.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_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 17552 bytes
SHA-256: 73ab78b1ef3cc5b03ef2e1e16111de5bed00e28e9be469dd85e17aaab6c3ecbf
font_02_sfnt_off000123b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B1 10496 bytes
SHA-256: 56bf6d31f5bd2883479a46af91c86ad61cd4aed90f5a45deb5b4194e050bec6b

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