Malicious PDF — malware analysis report

Static analysis result for SHA-256 133b7d93d9c69d76…

MALICIOUS

PDF

69.4 KB Created: 2021-09-15 16:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a1cf728bd17f47b6ff819c0c7a3af9ce SHA-1: 64fc3b8754ae52c42f778d7887c70dbc35129ce3 SHA-256: 133b7d93d9c69d76a015c26f83b99368873fd548d4876dacd355a054bace4ae1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://chcial.ru/uplcv?utm_term=common+words+that+start+with+f PDF link annotation
    • http://yilip.net/userData/board/file/15186712902.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/faratiz.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/31430126505.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140218323ae8---banuwiwavopunipurekuzow.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/75099403691.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/1750926638.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/movavixiwavapav.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/juwizos.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/34070873058.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/36348996567.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/14205356578.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/60450222673.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/32364701372.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/130731013165.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/79433425362.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/62923643411.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/66037565255.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/gibaxi.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/merimuvalagivujavofofum.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12535960096.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b24f56423---8967252162.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/kifuzogilupiwa.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///20955257040.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/80530606314.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/88657339843.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/fiponavesenatikovoko.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_off0000b131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC943 15380 bytes
SHA-256: e609b4e5d7b9d7e3c7302390e070d3336b1c9b98aa4c5e5a112826dfae7392df
font_02_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 10556 bytes
SHA-256: 6a25f7fa9c2c7e0f4bd24f7419f3d22e09a0c0d9413c710ced99e9ac9820d022

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