Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60891ee44a9bf8d…

MALICIOUS

PDF

74.3 KB Created: 2021-09-13 06:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac36d114c5371064b71036c157955d54 SHA-1: 03265b3ef381ae25586ee6f987c8b14ced9c4c63 SHA-256: a60891ee44a9bf8d74c54dda87229fabbfcb4912df5ebe6c946b6e192af90f19
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially malicious or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier clean score 0.2108

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ebiocell.com/uploadfile/file///2021090610162732.pdf In PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/pogisutoleg.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/luzijapadewanizusa.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/xajido.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/18199248414.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/40923548868.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/98992399896.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/vilux.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/mubibe.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/timebutakujadelo.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/85868527240.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/xomikizaxazekizewewiwak.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/fifewawaxadasewawubiz.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/76035670229.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/55820435409.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210911214755.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/vuzupilofumilebirunewefa.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613597e1e8fde---vutelofiraju.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/91777928045.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/40744175476.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/34064597689.pdfIn PDF document text
    • https://kimcert.org/E/file/zajereje.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/jenowavimem.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/63350574840.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210908153508.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/74710864338.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/75639684277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=deleted+photos+in+my+mobilePDF link annotation
    • 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_off0000ca3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 16964 bytes
SHA-256: d3a89b17c379929799f2d87ee9c64a0d6eb225aa0dd6bbf972251c38031e6fb4
font_01_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 10652 bytes
SHA-256: 4ca4e34b14a5e782800a876d5e476efccaf65ae3cbc28a5d3ca0c7518451e0d3
font_02_sfnt_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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