Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a15aa6656a5f60…

MALICIOUS

PDF

66.5 KB Created: 2021-09-25 01:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5902a42d0da62438a976986ff484b0d6 SHA-1: 849c757dcd0938407e189bcc6c49abe84f0f497e SHA-256: 78a15aa6656a5f60e8527e30733254e8e7658cab43767c0ebb33e5f67bc04be1
124 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 ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a campaign to distribute malicious files or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7539

Heuristics 4

  • 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
  • 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://bagumul.com/file_upload/spaw_upload/file/20210912160225.pdf In PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/temobifum.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/pegevuvirawetuge.pdfIn PDF document text
    • http://sbkf.org/files/files/pixowuvujatinebopeso.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/gobamag.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/pitux.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/nisodujevarobajofesa.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/jesoropogunus.pdfIn PDF document text
    • http://pk.mo/userfiles/file/46038396190.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c53e68344a---wesiwobapivur.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/sesigiwelu.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/63751455229.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/60621328310.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/raveligapemisumexorudim.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/12981606435.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/43811803999.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/31896916112.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210909191735856002pw7ra.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210916_08506B44401E93F0.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373503c97f9---xegozon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mobile+hacking+tools+for+androidPDF 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_off0000ad71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD71 10980 bytes
SHA-256: e98ed2476004d1ea0be7dbb5f23a284d38ec53a353a377df1c383d9c7e74b514
font_01_sfnt_off0000c6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AF 17320 bytes
SHA-256: 15bea0bee8ff6c35ba54678a479f632a5e616e6702d7db39fc8ab7ff18ee0185
font_02_sfnt_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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