Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3a225b6f4d4f1c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-09 11:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d693115c047463a7968e8afad038615 SHA-1: ca6c429f4c33bc7776b9506ffcc4002ec5459470 SHA-256: 2d3a225b6f4d4f1c3ed0df6f92e8c590a5996a28f66c3bf7f44a611fe87e1cc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to distribute links. While no scripts were explicitly extracted, the nature of PDF malware often involves JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b868bae8---85426295051.pdf In PDF document text
    • https://kalashad.com/userfiles/file/kefadar.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/44490541170.pdfIn PDF document text
    • http://jawarakreasi.com/file/lowid.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/namobefevimumumibasa.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/73261297897.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/6966940716.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3ed3cb21---75627365915.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210901001944.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/sigawogefidi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/95487785965.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/pawopurilov.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/1527723635.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/71248926417.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/zorisuroxi.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/18761039207.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/20093626846.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/fufakux.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/winilalitosagevexuzapo.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/43060159475.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/83752731545.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/finup.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/28549242886.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/seguziwipenitezolaramulak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=watch+barbershop+3+online+freePDF link annotation
    • 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_off0000c5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F3 16424 bytes
SHA-256: 020da45b5df3b48e2d74103faf40a0fc99f759a577e647c5a008bfeba4a58e5a
font_01_sfnt_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 10884 bytes
SHA-256: 5ab019c4bbb36a86327c9da795236bd40b780dd315688ae34091a14ac2e99709