Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6859e716e98317…

MALICIOUS

PDF

96.4 KB Created: 2021-09-20 17:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 59e16854102bf2c98d09f17d40c3b57c SHA-1: 57926346e899c6566c35ce7ddddb1720561377c9 SHA-256: ab6859e716e983175bf8d7d0874ed785aa0c055a22e6eab7a6554f3ef795583e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It includes numerous external URIs, many pointing to PDF files on disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further malicious activity such as downloading additional payloads or redirecting the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://www.park-seversk.ru/other/js/ckfinder/userfiles/files/kefeparon.pdf In PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/gofinaxufetijalufono.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/89643481428.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/33059761267.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/jojuxineredabasavefi.pdfIn PDF document text
    • http://elitvorota.ru/f/file/8284319870.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/89801920592.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/komimopetosukareruliv.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/jusimegopepifozozegar.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/21986377248.pdfIn PDF document text
    • http://honkakuji.jp/honkakuji/images/ckfinder/files/kawobujesivagerepafaxa.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/xonulo.pdfIn PDF document text
    • http://mega.kz/media/upload/files/95480282835.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-7/20210907072434201008.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/67132257458.pdfIn PDF document text
    • http://rubensova16.cz/files/file/womiti.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/rinirumewadejowupeg.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/4677516987.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1132920c0e62623b46b96a119b76995a/depulojekufiperiz.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/57970086050.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mhv9uoo3lke3q4f7ad11kquorh/jorinalasulod.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/7213448228.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/60491391032.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/93189472540.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/17848608846.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/22012208042.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/memogerosen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=followers+instagram+free+no+passwordPDF 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_off000111bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 18696 bytes
SHA-256: 15c3a6197b274d0b20851414212809ff4117561de218970000f3b8ec0f588aa2
font_01_sfnt_off00014291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA8 10904 bytes
SHA-256: fd4726792d2500f2bc5574b74e8f6986f2a203ff467350a2f0096450606fd5c6