Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b09e21c583e920…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 06:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 994403cac0dc1451a42acc977bd55e7b SHA-1: 04c27fb3a53e7c6618c4ca913e81b48486649f31 SHA-256: 85b09e21c583e9201054ebe514dcb524b4e38c782868eefed65aacaa9c052863
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://reanda.com/jingkelun/userfiles/files/20210916195310.pdf In PDF document text
    • http://hidrometa.com/images_upload/files/40806281696.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/jusuzufaxixuxedonekexi.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/79818217684.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/26500242688.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zejukusototowepakozeru.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/ximesezekefedegokizo.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/89593246260.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/62907982899.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/dobegabegudutazubimulibij.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/sapixurake.pdfIn PDF document text
    • http://artio.pl/files/files/72386900282.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613920534fa2a---sesimujeka.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/powigozufixuxobopid.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/vutosamegemez.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/88667127070.pdfIn PDF document text
    • http://a899.net/userfiles/file/jurinujazab.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/71887061236.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/12337804870.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/rurusegipuloxoredetuwitef.pdfIn PDF document text
    • http://destockbaby.com/ckfinder/userfiles/files/figewalumiserozidawo.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/48347579548.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a57808f6---65750097370.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/xegezorapulixudodoluk.pdfIn PDF document text
    • http://honghuibio.com/d/files/78020139885.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/14311611870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pang+adventures+apkPDF 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_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 10568 bytes
SHA-256: aa94757aad25536f01079d82d20c34de03b05dcecfe5712a9cf54b37cf351df9
font_01_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 19180 bytes
SHA-256: 113e3d2f4506a53d336e04ab605ec0bb98aaf347f66104e9d1cdb96428ef7d30
font_02_sfnt_off0001221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1