Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d3f5633d7bfb4e…

MALICIOUS

PDF

71.9 KB Created: 2021-10-02 12:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1cadae4825ed4d435b2172c911d29e30 SHA-1: a7d22a4afb68b2ad17277433c629abd2d4c84aff SHA-256: 46d3f5633d7bfb4e7ac432d4b556f27462a97f457bd2a7e91e78ad8541ca66f5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest an attempt to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=mayer%27s+cognitive+theory+of+multimedia+learning+pdf PDF link annotation
    • https://mariapolis.es/ckfinder/userfiles/files/47163861586.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/bekejokufejasaminud.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/rimafazuvezogiwuzikatan.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/zuziwex.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/6055481459.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/41743364336.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/josikekamu.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/naroxagezobewobawafamij.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/ronuwuwevetiduturidove.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/betarixugirawuzawededet.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/wamelepodetogi.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/werexeviludekazijireme.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/349793f825459c059384d2758c8d61ad/sodopuderofawanikijopo.pdfIn PDF document text
    • http://twilaw.com/files/files/84551956911.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/zalapizunudazebosegilore.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614564e398c92---89655958003.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/97242702888.pdfIn PDF document text
    • http://sarafis.pl/img/userfiles/file/65408411698.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/86188751283.pdfIn PDF document text
    • https://griffithnorthsideapartments.com/ckfinder/userfiles/files/12444493917.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/bojuvug.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/45095787655.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/votudixoruluzisubawosi.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/katot.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_off0000b36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36D 17160 bytes
SHA-256: cff8f6a4adaa70e2a14096371120a9b3062471579567f6cfe26fcac765c4bef4
font_01_sfnt_off0000df32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF32 11372 bytes
SHA-256: 2a9821e9cc38f56ee35e951b24e76b098a02f68e736481707af5ac81456ad243
font_02_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1