Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b86a025203bbd2a…

MALICIOUS

PDF

58.9 KB Created: 2021-09-22 15:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 983408585e79d2af4b5cbc281e1806ef SHA-1: 3c3d55d3df4ea5f779ad8f30666c87d739117b74 SHA-256: 4b86a025203bbd2a5a32a9c839f0e753a2e86e94f997e07a838bc7f815ed005b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm, suggesting a phishing or redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to obscure the final destination by using multiple disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7591

Heuristics 4

  • 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
  • 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://prompol.com/media/file/xafibutegupa.pdf In PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/xodosuramogop.pdfIn PDF document text
    • http://ibb-online.ru/f/file/1720527372.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/wawikelabupanujojekow.pdfIn PDF document text
    • http://355353.ru/userfiles/file/pixatowovepomopofavigesi.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/78058599014.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/fexavitapumarobikirelin.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/zagenabojuwuziwafi.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/3813bdaf637481c0af2901533e22c706.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/pelut.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/50321435783.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/5916261619.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613db5e3cef0e---240070836.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/zobidetirojo.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/xasatelesodudafo.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/40960473374.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/kojepapuliva.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/34560762514.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/41642877221.pdfIn PDF document text
    • http://floramarble.com/uploads/vusafoguwifofovibuzeru.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/lojilorarapuvesugaso.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/95699894639.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147adf17b431---zujopanukinoporufover.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/38252787754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=why+are+my+applications+crashingPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 10928 bytes
SHA-256: 11ddf72759925895be7ca9c6b350a764e188dcd9ff2211d712f964da392fd4cc