Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade7c3378c4d0e92…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 03:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 574a69797fc6657bcfb3860a884f5089 SHA-1: aa088eb2df6f9b7b4779463f4884b281fe280efe SHA-256: ade7c3378c4d0e9206f83aeeb28527a048d7e8dcdccea9f9e9afc999c03dfd17
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 hosted on disposable domains. 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 0.9965

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://krisoc.ru/uplcv?utm_term=50+mb+ka+game PDF link annotation
    • http://rkmaster.ru/uploads/files/56790026364.pdfIn PDF document text
    • http://art-ball.net/files/file/71874878367.pdfIn PDF document text
    • https://ottopianos.nl/files/mozeturixolajepigure.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/38683048065.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090720373342.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/82051600987.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/3550260778.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/41860049428.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a86d9c9b8---lunututado.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210905025644090.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/drk4nh6v5b8lnj0pb78bh88ba9/deriduwudasamex.pdfIn PDF document text
    • http://8njl.com/userfiles/files/76860864699.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/7365889786.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/37639608997.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/53734794825.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/45295982622.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/jafetevi.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/webawenedonizu.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/66553325203.pdfIn PDF document text
    • http://master-vin.ru/files/file/26875723805.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/vibukozeka.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/16430871046.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_off0000aeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB1 17688 bytes
SHA-256: 2d902d8352d9043f1e82288f5708bc34b8ab5273fa3cfaf48a8892f45d6a81ed
font_01_sfnt_off0000dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 10116 bytes
SHA-256: 6347c8ae43dbcaa6f7d915dae357b79fd8720dfc51779262718446c5630949c8

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