Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95edf1be7b1b595…

MALICIOUS

PDF

86.5 KB Created: 2021-09-22 14:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a04e6963bcb7c5b5248ba91925f26fe4 SHA-1: ff4f89b9b36c540ab83abf836b3be9c1440f92f0 SHA-256: c95edf1be7b1b59594382b587dc0c992a1ddeb627e1d2b0419b3a41140d33d22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant portion pointing to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://85560891.com/upfolder/e/files/20210905202257.pdf In PDF document text
    • https://vas-vill.hu/userfiles/file/14070579033.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/dimojagujigipaminitusat.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/19694236932.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/zazexadona.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/laguwafowudezedigupu.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/99106852827.pdfIn PDF document text
    • http://chinalabware.ru/d/files/xupanaxonedezewevetote.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/19662238533.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/45036553811.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/87689720208.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/pazefu.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/biziwanimijuvoxozebed.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/kakesapakogajevetegifor.pdfIn PDF document text
    • http://archbot.pl/files/file/39339139295.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/fafumoweboramidujataxo.pdfIn PDF document text
    • https://iword.de/userfiles/file/87929594041.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8eaea90f26e6bdb4c7f5455b0113b4e6/15009446556.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/88286894889.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/liwolumi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16145f98c43b0c---26935104120.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/fizunofiba.pdfIn PDF document text
    • https://ptogel2.com/contents/files/jipobaxemewadiledise.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/78453366135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=az+screen+recorder+no+soundPDF 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_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 10108 bytes
SHA-256: f3760b188b70f57b6039f102c5a39ecbe2a7bb93de8c3786cb8d663a375a03b3
font_02_sfnt_off00011907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11907 19900 bytes
SHA-256: f701461382f6f7e669baf4fc80bca1144356fa31adbeed6e5b6c5ad37f8f4642