Malicious PDF — malware analysis report

Static analysis result for SHA-256 e902476c2d010eeb…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 23:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ead05c66705a6dcfec549da19f6a64eb SHA-1: ff8b24a11e71b915d4db07d07f1309faef385c9b SHA-256: e902476c2d010eeb9352653fbe842115d38ea72b806c91cf4bb24013cd079380
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates potential for further malicious actions, such as downloading secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=pokemon+go+joystick+android+10 PDF link annotation
    • http://moskvaznaet.ru/upload/files/11505540357.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/49360455821.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/ralabema.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/8271073824.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/tifikajaborelagusar.pdfIn PDF document text
    • http://peoplefoster.com/pliki/50599116525.pdfIn PDF document text
    • http://www.siposferenc.hu/html/vogutilupexewula.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/pulilab.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/tanugonakitaworenine.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/67520448939.pdfIn PDF document text
    • http://alvitraders.com/files/4476538221.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/4511485226.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/81248347942.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/nisavefedutatalim.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/90388944870.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/11509791845.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/33855516749.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/povegi.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/lixokugufitesisan.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613864b2745f5---tigipixonekoti.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/47474689586.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c653c8bfa---77389831622.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/vanajaso.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_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 11180 bytes
SHA-256: 1d70a770539535ed6a991283e1adacf40b0cee61cff9a496fb7c462e2afd468c
font_02_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 18600 bytes
SHA-256: 755040ef4b69aef31c3ca52c2fd754be64a168c9c5112a4970fac9d425940ce9

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