Malicious PDF — malware analysis report

Static analysis result for SHA-256 321e53745bebe39c…

MALICIOUS

PDF

70.6 KB Created: 2021-09-11 22:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b49dd9be2c84647341763e5129a2779 SHA-1: dd436f0e35e1e4160f38530616068ab93d9abf09 SHA-256: 321e53745bebe39ce2ce97bd5dfa12ce7b6c3e921e598726b0fe5090a235836e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to obscure the true destination, and the presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user. The primary purpose appears to be directing users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=how+to+use+progress+bar+in+android+studio
    • http://isisthailand.org/file_media/file_image/file/20882109573.pdf
    • http://cantinachitarra.it/userfiles/file/peruvudoxozurijezovane.pdf
    • http://neboskreb-irk.ru/uploads/userfiles/files/95706012378.pdf
    • http://cn-biyoute.com/d/files/buriboxowufo.pdf
    • https://gmt-tw.com/app/webroot/userfiles/files/xazilapezafoziwaxekike.pdf
    • http://athaj2.specialty-match.com/upload/files/pizetarubibizij.pdf
    • https://www.fangjin.org/ckfinder/userfiles/files/rimadozufitudenoku.pdf
    • http://hotelbasantresidency.com/uploads/95476959673.pdf
    • https://shunnasato.com/lokanizebaresomulotata.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134336668da3---55478373763.pdf
    • http://paintmaster.hu/js/ckfinder/userfiles/files/zapubo.pdf
    • http://hwangtosidae.com/userData/ebizro_board/file/9114581922.pdf
    • http://sbnjl.com/userfiles/files/welokupevewujamex.pdf
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/renumojopitakom.pdf
    • https://jackinthegymtpe.com/uploads/files/202109010200309934.pdf
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/99114499363.pdf
    • http://bestpokeya.com/uploads/files/69486239156.pdf
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/13559593438.pdf
    • http://garageanything.com/js/upload/files/rofiserateposatapem.pdf
    • http://droneducational.com/admin/userfiles/file/fakimakat.pdf
    • https://vatlieutaphu.com/upload/files/ribozefab.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/876481111.pdf
    • http://rencontres-icare.org/userfiles/file/64064623728.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afc2.bin
3e7f72f946e04da5431b7993bceb6160ebb2d24997e2447f9ee9129cc810ff77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC2 17216 bytes
font_01_sfnt_off0000dbb0.bin
a6549d5aa15697bef37f5246887dbb8e20b1a70972e2643eb104557b26c5b15d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 10836 bytes
font_02_sfnt_off0000f46e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 16792 bytes

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