Malicious PDF — malware analysis report

Static analysis result for SHA-256 680cd77df6baaf38…

MALICIOUS

PDF

88.2 KB Created: 2021-09-18 15:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9b912aff9b8a51f32dcd3e7fb1e6fa2 SHA-1: 01cea7d6e08a05e19287045efd5944ca98bab107 SHA-256: 680cd77df6baaf384979a99bfe6c4d04a3df8cd088b51aec53f0bce6cfb69a10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs pointing to various domains, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious or deceptive content, aligning with phishing or SEO manipulation tactics.

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 http://bursaceyizgelinlik.com/images_upload/files/32090851200.pdf In PDF document text
    • http://bortran.com/upload/image/file/20210914104337.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/buludenasofupo.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f74c14452---47116874064.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6dc14aee0---47718098734.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/naniwet.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/44987570582.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/zajifesevesipipokepomakun.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/jewamopunezibuxijatifonip.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/15911890891.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/jeregiwojeri.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/xixurato.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/70807069514.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/mobufebed.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/folimage.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/jiniwigu.pdfIn PDF document text
    • http://adice-area.com/pictures/files/jotewugaropebodije.pdfIn PDF document text
    • http://iphysiology.ru/upload/budifefovidak.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/89010459533.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/62674965600.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/85030843852.pdfIn PDF document text
    • http://szm.hu/userfiles/file/4741952581.pdfIn PDF document text
    • https://preciseenergygroup.com/media/donuzanonomupamag.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210915_1F8A406C7CEC6517.pdfIn PDF document text
    • https://emenu.hu/editor_up/gipitokuwaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=top+ten+battle+royale+games+for+androidPDF 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_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 18212 bytes
SHA-256: 892f45650b925c3f7cb7131cf91ee4542e571e0ee2f959d911733ab3333800d9
font_02_sfnt_off0001393e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393E 11056 bytes
SHA-256: b621a9d62cad4e4c416af2203d6301300deb417a8fe56929a7ea7119de9e2676