Malicious PDF — malware analysis report

Static analysis result for SHA-256 f665ed3cd6827dd2…

MALICIOUS

PDF

90.2 KB Created: 2021-10-18 14:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 046a15f2688d24f7ec66fa385742de0f SHA-1: 8dde0373b63ff28f40aad5474b332e2be74d5d48 SHA-256: f665ed3cd6827dd299101406907a7c27a3d472b211217fe601692f34b8a16e28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The primary purpose appears to be directing users to potentially malicious content hosted across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://timminsrenovations.ca/file/w6q8zX8kolwHgNKC.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161672bfa4385a---wenax.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615cc7c515f2a---63482071098.pdfIn PDF document text
    • http://centronegozi.com/public/16394377733.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/21625489488.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/76698633174.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/kozug.pdfIn PDF document text
    • http://fullx.net/files/xuzawexipasum.pdfIn PDF document text
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/lubuze.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/27828064029.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/38345850470.pdfIn PDF document text
    • http://thepartybooker.com/userfiles/file/4911078066.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/vinuketilevu.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/45384213594.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/liwedefavogob.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/ganibasij.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/kelejigumuniligilu.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/xuluzivumo.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/gukepananavak.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/50449171977.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021917164619631.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/79898454677.pdfIn PDF document text
    • http://thuannam.com/image/files/vuziji.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/basiti.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/xokegije.pdfIn PDF document text
    • https://adikmanis.com/contents/files/9406787005.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RhDyTiV0TgQ/uplcv?utm_term=evolution+practice+questions+answersPDF 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_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 17724 bytes
SHA-256: 938bc9f5d4b1c810ce8a88d48602d20195d1e7d17657cd103dcb313227c8e961
font_01_sfnt_off000129bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D4 10748 bytes
SHA-256: f8c3b2594f29cba80e3d0270fdd8a8d3e850dbcee25daf2ab176ffce33e92798