Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce10500bbfeec39…

MALICIOUS

PDF

109.0 KB Created: 2021-09-09 14:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1fa49c9719e8ec68e8e8e782835622fd SHA-1: c48ae673f4429da6b36ef44cc753a4340e8ac563 SHA-256: 0ce10500bbfeec396ee44ea03854c7e0f7014aa92bb4252f79cd251679678d9d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://synerhu.ru/uplcv?utm_term=fusion+360+sheet+metal+tutorial+pdf PDF link annotation
    • http://jhdljz.com/userfiles/file/1630497443.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/15377646319.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/23764300942.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/sapedisugovalewubixosaxi.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/45221593681.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/84500728865.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/37140185487.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/4323870743.pdfIn PDF document text
    • https://mimpishio.com/contents/files/kudegesovaxutufebusova.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/sowavubuguxi.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/dqj8kho67ttvd4j5bpfibdhkhk/52471611474.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/20446311431.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6dcd47de---26774868233.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/33568796536.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/xoxeneridafomuse.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/23461369734.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/65255875468.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/46691086644.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-1/20210901203638724363.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/nazulowavudenidezedibo.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/1738425063.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210903_075622.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/vefogirel.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/78420386693.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_off0001437f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437F 11300 bytes
SHA-256: 627731abaa47f5b854c2f046dd134051ad69f6963bece1b22c931f9cd64469d2
font_01_sfnt_off00015dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD6 18476 bytes
SHA-256: f4d555cf1ec4b0c7b4ea4c6eefcf0762c7d3f9afc3869c88c985b3928438b4a8
font_02_sfnt_off00018e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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