Malicious PDF — malware analysis report

Static analysis result for SHA-256 96936ba2d890ce74…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 21:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 380e56e808c98c51edb009256163f773 SHA-1: 342b3986faf29e9b6c00c5a2b88517d8d2a9bdb6 SHA-256: 96936ba2d890ce74f0fcbd35c83852dd4ff02f425ec39fdbf4c97a5e1693cf89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://alessandrobelleseveterinario.eu/userfiles/files/68249916757.pdf In PDF document text
    • http://twfindia.in/userfiles/files/95967140603.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/23034810873.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/34705214490.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16319451422715.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/fafafudozigewuvaz.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/vaxazofobobalegudum.pdfIn PDF document text
    • http://na3.it/misc/file/92429769398.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e68077397---nivavikubifun.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/51527350687.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/18612484178.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/38478164996.pdfIn PDF document text
    • https://wonkingchina.com/d/files/61020643739.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210905_3C1F07290F472F77.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/88223210604.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/87979851999.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/vamivom.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/830d41714ea72b715fd2902c985d08e2/jusebeju.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/jusiwabixiferijuxamafos.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/86283159901.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/bagaramagapodavonurugu.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/78381575897.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/fudibivenumupab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=dvoretsky%27s+endgame+manual+5th+edition+pdfPDF 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_off0000c09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09D 11488 bytes
SHA-256: e08b1c0a70f5755389f96440bbe3e848c1e7632bbe684b23f661a3cff854e8c1
font_01_sfnt_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 18268 bytes
SHA-256: 33e76149f6c9eb69062ef7bfce34e93c21bdab7934b6f0327c8c79eb5ac0a1d5
font_02_sfnt_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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