Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f5db762c542013…

MALICIOUS

PDF

71.7 KB Created: 2021-09-30 19:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f0688b4bf594f01b7bc0e949fbbfb88b SHA-1: 835ce93bae32fcf56d8996f3c4d29dc9ca1004e8 SHA-256: c7f5db762c542013612656df910f5db801b47965d00cf2e40436dcb6e8842757
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to potentially malicious domains, indicating a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection point towards a phishing or trojanized PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lamekatus.com/uploads/ckeditor/files/17371758568.pdf In PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/pegevuvirawetuge.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/52390203617.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/81935883376.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142e262b7b99---72126948975.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/karirag.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/7217288497.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/54732021559.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/35855918967.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/fulifa.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/fejaz.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/kewokax.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/wobomowenimanof.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/68897854937.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd04f2b8dd---83730303469.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/fapuvezufexin.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/15216712457.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210916060728.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/98573215057.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/filogesiwanuwesipijupi.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/45035469040.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/wigitorinarikajuxibeso.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/23870839099.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/gepoxiveruzimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=paw+patrol+all+grown+upPDF 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_off0000b367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB367 10220 bytes
SHA-256: 1983727d45328e79a6659edd7a89b6cd7909b75725886d9bc9dc247beb08c1df
font_01_sfnt_off0000ca87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA87 17488 bytes
SHA-256: 46b90f0b56035f39a049d90c2cc579a59bb546eb37c5c7186f2ee943fcfedb7a
font_02_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1