Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5b124ab2b70d20…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 11:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: edd948c577ee05ab82c552ab5fde7698 SHA-1: 2e7882d2ded5ac0c2b25b83bfaf31f7d9821bd78 SHA-256: 2c5b124ab2b70d20be8b617ce11b3a4d3b8dbddbd408bf46e2b583fba51f6d0f
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, with many pointing to potentially malicious or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9798

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://garageanything.com/js/upload/files/zutevedude.pdf In PDF document text
    • https://girisimhaber.com/uploads/file/82675385546.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/81130386475.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/63382674276.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/24135638993.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/xuxepotigazaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413541abaac---koduzuvizipibu.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/texorobadus.pdfIn PDF document text
    • http://fitviewer.info/files/file/74633329026.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/jireni.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/fusab.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/9687869668.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/gusafotulixusivebatepuzi.pdfIn PDF document text
    • http://balone.net/_upload/file///mojibobeto.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/rekivexi.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/12902721819.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/97758585950.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/fuvewuvirumopepi.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/zexafajul.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/tifezi.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/34154230165.pdfIn PDF document text
    • http://insei.eu/userfiles/files/fovubinupuxa.pdfIn PDF document text
    • http://12shio5.com/contents/files/77017618546.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/voxuditetewifobov.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kebufunemomajapupoxafon.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/56592916464.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/51984543578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+android+wallpaper+freePDF 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_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 10632 bytes
SHA-256: 4dc460936d289fb6717e4b64b6dec405e528385e9063c45e0848f4f2d5af0e1c
font_01_sfnt_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 17664 bytes
SHA-256: 6954c73dd4cf4bcc0dc833a885816fbf50f7c291b475894a151a7952f678011c
font_02_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1