Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e28e57362ed775…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 07:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 879ec6234f0dfaf170d7a2571449c0e5 SHA-1: d3c5bb8c0882a6730a55c8060c982946569ac81f SHA-256: 05e28e57362ed7757fa79d7c0cad5181f767e3c887cf21e01fb1bb84a04a8fb0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to harmful sites. The embedded JavaScript is a common technique for obfuscating malicious redirects or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crysiq.ru/uplcv?utm_term=percy+jackson+and+greek+gods+pdf PDF link annotation
    • http://ufnk.fr/app/webroot/files/file/35122274872.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/zaxovomawolikidatuzo.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/31875079275.pdfIn PDF document text
    • https://tepihtrava.rs/files/47171653715.pdfIn PDF document text
    • http://nanopena.cz/upload/file/47185150137.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/gilalekixinedasojufolu.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/gipubopatafozenudutujiba.pdfIn PDF document text
    • http://zeci.nl/im/image/59476867951.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/99630939430.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/464d0fa8cad21727583d627cb0038a66/belinexubutuxaradawi.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/nilegetezogigejujelaxo.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/85931288986.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/58633088103.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/63196568276.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b63840ad54---20891643867.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/safimusivarajizuru.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/2880002367.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/67822666313.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/75266927139.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/39576039232.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/79086151221.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/nuwoxipoduxowufim.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_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 18316 bytes
SHA-256: 5ef61e84ce519c310e973f2137a2973b6171240cee03b345bbde4414224a026a
font_02_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 10896 bytes
SHA-256: cf0c2d85ca29bbd5b1cecf8050f945994e2e38b5afeb4fe494fc42bf924b41f1

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