Malicious PDF — malware analysis report

Static analysis result for SHA-256 869a61bede2cd182…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 14:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b59232c209a3d0da3324c7752ad2dcb5 SHA-1: 3ddbcded31ae18181d15f8359f3f1ee85851de6b SHA-256: 869a61bede2cd1828b034f2e6945041dc15670e22b26a62fa5b4ea0ef4ef390e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm used for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The ClamAV detection further confirms this, identifying it as 'Pdf.Phishing.Trojan'. The primary attack pattern involves directing users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/uplcv?utm_term=infinite+flight+flight+simulator+download PDF link annotation
    • http://e-baze.lv/images/site/file/vejesenarupuwufekeder.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091006201399.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210923014931933470bku0w.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/44014787847.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/17562733043.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/dororijubidi.pdfIn PDF document text
    • http://potlista.com/file/files/bofewago.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/reruxefamifirax.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/12374583107.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-2/20210902054957406920.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/87424132149.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/80049916185.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///luremonurubanavizovesov.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/godofobuzufe.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06babd2d1---kirojobajusomige.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/51331207083.pdfIn PDF document text
    • http://viettruss.com/upload/file/36942358618.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/valajodote.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/989821846.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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 10936 bytes
SHA-256: 2aac45c015a83f11d97ce5f93633e94632cadfa32699cef4ecdb06b27894ba18
font_01_sfnt_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 16980 bytes
SHA-256: cc3d4589afe3c733c79b5472e43586761c7dc2d59794d641e18a6187f14cf21a
font_02_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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