Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1e29c10888ad74…

MALICIOUS

PDF

72.7 KB Created: 2021-09-23 04:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4e639c6abfd1115ac0273262c75d0a86 SHA-1: 447d19747c33fa060cf383508429a4caaf20c955 SHA-256: 8b1e29c10888ad74df1237fcf8bc56f651398ba914eed7d78d7108f9727cdf13
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=satya+prakash+quantum+mechanics+book+pdf PDF link annotation
    • http://studiocommercialedelpiano.it/userfiles/files/89954545246.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecbc57447d---33209999135.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/20195511877.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/66472226352.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/83406422589.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/nemexawuvaj.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/18658031965.pdfIn PDF document text
    • http://inica.org/files/file///55566225067.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/dakev.pdfIn PDF document text
    • http://artospace.com/pics/file/94468497432.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/vewabidizazak.pdfIn PDF document text
    • https://mimpishio.com/contents/files/67425694638.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/jepubujadulikisubum.pdfIn PDF document text
    • https://digireg.ru/upload/11292582356.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/42546137910.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109061448336889.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/42150166986.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/rakogatefabine.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/1540673402613eef4c24972.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/lavemebeporud.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/89416834612.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/12461374251.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/19832002000.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/82519280849.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/pozud.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_off0000b78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9F 16532 bytes
SHA-256: f877bc3f68c2d08c2a59ca91e7716a64656f9e1b38671c8d2d37074cc3d4017d
font_02_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 11508 bytes
SHA-256: 367e243d394709cd4ca02c3aa395a39a5a98af8a3ae7d326d60802ab1313925c

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