Malicious PDF — malware analysis report

Static analysis result for SHA-256 e614843a65ad97b4…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 18:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: febdb3c9f5ab7230d21f18c6cfc2631f SHA-1: 8cf742b0e0ee9b89bad0b818ad9519a43209ed10 SHA-256: e614843a65ad97b45f8929eff342cca463e8ee45c7509a8e3b187727ad0077ef
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 hosted on disposable domains and appear to be part of a link farm. 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 0.9956

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://infrive.ru/uplcv?utm_term=gain+instagram+followers+app+free PDF link annotation
    • http://intimatehotelpattaya.com/image/upload/File/pejifonuwenij.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/76140179559.pdfIn PDF document text
    • http://asqcert.net/files/files/19156446341.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/jukoboko.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16150568fe33b0---pikuwafirutoluxeruw.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/66825959985.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/bipigajoni.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/terevezubapapuje.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/vuvusaxevexuxibata.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/8370577985.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/76770584824.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/sujuxugoxup.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/76608015864.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/7721086021.pdfIn PDF document text
    • http://kbchina.de/upload/23729084866.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/72266367298.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/nebosetegofitipepugolegu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16145922119908---kasusofikuporizafemoki.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/piwukekogovutevubanoki.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/87683578243.pdfIn PDF document text
    • http://recrute.fr/files/files/biwoka.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/rotomufuniku.pdfIn PDF document text
    • http://htwy.com/upload/file/rakifixanego.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_off0000b1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A7 17764 bytes
SHA-256: 63214e6854449b34d61f55dadd2a346c79feaf1017fd560b410d1edae8d0539f
font_01_sfnt_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 10824 bytes
SHA-256: 13ea9f5c1d8207828da6e43bd9254e0405414103c3376e05d97e59edc2960ed7

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