Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbbcc28e5514da7…

MALICIOUS

PDF

86.9 KB Created: 2021-10-09 23:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ace88b3e0622904ce9117d40cd61d263 SHA-1: a54e681906009802ea81e439e57acce2a2aeb371 SHA-256: cdbbcc28e5514da751ad0e00eba8740504006808b52f58825838fcd9164afc00
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to phishing or malware download sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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
  • 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://tdybio.com/uploadfile/file///2021100910042789.pdf
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/79540936534.pdf
    • http://puebloexec.com/userfiles/file/4182039978.pdf
    • http://tuyothuyluc.vn/webroot/img/files/denomemulo.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/bedonominovopefepokexi.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/xefemujawamamidikiwoje.pdf
    • http://tongrentangthai.com/UserFiles/file/61028559648.pdf
    • http://gutachterbewertung.de/userfiles/file/pipibuvase.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffd2086b3f---58793106380.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/gegojibuduguzinozotimesow.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/powanezubizosomulege.pdf
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/58732573058.pdf
    • https://fiscconsulting.com/userfiles/file/lutozaveg.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614241e13a0f5---77687837592.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/larazirulovalev.pdf
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/64091740579.pdf
    • http://onthebroadway.com/CPD/adminpanel/upload/file/dubexadefib.pdf
    • https://strechybenesov.cz/content/33732402042.pdf
    • http://kqcme.yiaiwang.com.cn/upload/files/25930583583.pdf
    • http://teplorium.su/userfiles/file/golasufoperigaxufipiwu.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/zegezevokoreloweguvi.pdf
    • http://glavis.biz/userfiles/file/90838069409.pdf
    • https://hujanuang.com/contents/files/bimunedafezutitaxela.pdf
    • https://mistral-paints.cz/userfiles/files/13872355777.pdf
    • https://loyallcanada.net/editor_files/file/lebokafuxakumivut.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=horse+amino+acid+sequence+in+cytochrome+c
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fc.bin
3c77cecee25248136df051e3d42ffbb211b5dda87f2b3289ca98a9d5640732ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 19984 bytes
font_01_sfnt_off00011cae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAE 16792 bytes
font_02_sfnt_off000134c5.bin
18206c4d1f6495adae9b3eadcdd7581355513578b6ba4c88a0176a507a7dac1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134C5 10940 bytes

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