Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f904c5398310ea…

MALICIOUS

PDF

80.7 KB Created: 2021-10-09 04:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c03f995f30908286823d69af3a805daa SHA-1: 519b4f41190827e80a7da1b7d96fec10cbb243b8 SHA-256: d1f904c5398310eaa4aa34a7b7006c3cbc8062ae43d5848c474faaecd47ab871
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which are likely disposable link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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=1500mm+to+ft PDF link annotation
    • https://ratsimae.ee/media/contents/file/dulejafobobatufoxe.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/689598932.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/44592732685.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/46024445140.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/dekuzelupuk.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/mokesinelogoges.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021100309251782.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/giwabifuzus.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/41040245743.pdfIn PDF document text
    • https://fong-cai.com/upload/files/39129630882.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/75487905920.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/subivitodorexumowoli.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/35712465549.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/8053705138.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/wivimoripe.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/38282803192.pdfIn PDF document text
    • http://photo-poligrafic.ru/ckfinder/userfiles/files/46793249260.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/63835199358.pdfIn PDF document text
    • https://olekiwaszkiewicz.pl/userfiles/file/10186016899.pdfIn PDF document text
    • https://rippa.pt/files/file/jipepezekekuzolarumituwum.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_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 9780 bytes
SHA-256: c2e382e09b25698ae529667a6066664fd70ec292e14fd01894e43d3db1f7641d
font_01_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 18452 bytes
SHA-256: d5b2774c6809394ceaf8d22c1b60426469e1a828db650a0a08f7a460aa41f9aa

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