Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccbc29594c5af66…

MALICIOUS

PDF

76.0 KB Created: 2021-09-16 01:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d8546fa3c3ad001c42f86da8c3a167c SHA-1: 6b131e1bea3bc1bd5980d90eedf4ecef40e86669 SHA-256: bccbc29594c5af663455175778d14b6720da9c05a909c0e9b7f2aa678708f7a8
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The PDF contains numerous embedded URLs, many pointing to link farms hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. The presence of multiple PDF-specific heuristics further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/90873106607.pdf In PDF document text
    • http://yongchengtech.com/uploads/files/202109131038203269.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161365c9eb9960---runuvuruzoto.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/58498446420.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/69146598279.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/28308897440.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/xibexoxamowogog.pdfIn PDF document text
    • http://sdds.be/userfiles/file/wijitiruner.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wawajiduriwudojexawimi.pdfIn PDF document text
    • http://podarox.ru/public/files/16855981201.pdfIn PDF document text
    • https://titishop.co/upload/files/45423882084.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/89574123688.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/66944082849.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/kigut.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/faxopejejudof.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/wasaxo.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/neramubujawawo.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/57982403555.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/zanopobewezapuxozosemo.pdfIn PDF document text
    • http://th-hl.com///upload/files/muluzewisi.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/baxofofivusalotubuv.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/motoremefopovusedo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/55606176371.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/jonovugafemadiwabunomu.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/junidawado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=turbo+racing+3d+hack+version+downloadPDF 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_off0000c470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC470 11168 bytes
SHA-256: 82bc5dd50c2e8c0614fd6abfb9a3fdc05b4c029a159f493aa3e71952cf366e2f
font_01_sfnt_off0000de5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 16748 bytes
SHA-256: ce8d57f77560360d54d1dbeb7ae7f74e911e5e0f8c9b3cb28fa2fd1ceed6ca5c
font_02_sfnt_off000109f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1