Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abdb6b94dacefc9…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 03:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9ba7899ac7cba697c085b91c6503381 SHA-1: 4c47741e5c13ba7ade7a58bf2987c0ba881f2c3b SHA-256: 4abdb6b94dacefc938e107c5a378bb53a255119764ac63623a43ff4c59b3c10f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The presence of numerous external URIs, including a link farm on disposable hosting, suggests an attempt to manipulate search engine results or distribute additional malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://levakov132.ru/userfiles/file/gufetajeropipeb.pdf In PDF document text
    • http://galerie45.com/userfiles/file/9174490438.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/59335325338.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/fuvobi.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/36173336350.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/wikurimexasu.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109040420048840.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/rirumabogarelet.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/77102439438.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/76492557292.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367888e0c4f---75632789654.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109151301397901.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/61275126608.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/2054474317.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a4d601c2fdc156fa999534f79956c6e9/84539026353.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/zofadu.pdfIn PDF document text
    • https://laps.pl/userfiles/file/jomovup.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/69429841853.pdfIn PDF document text
    • http://retrofotr.cz/files/file/30742310328.pdfIn PDF document text
    • http://ktcz.eu/files/files/78307380122.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/12415215815.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/revaxonokuvemelusiguwipog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+hard+reset+toolPDF link annotation
    • 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_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 18208 bytes
SHA-256: 5b4280508d6ae80bc33ea35cbb1d17c3346e481d029f36126b321abee18d7ea5
font_01_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 10328 bytes
SHA-256: 5824b88f46f849da0d1e9c6392296586df15e4e7c24c8b4b774eb9214d44fdca
font_02_sfnt_off00012bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1