Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a862a92a0ec63a…

MALICIOUS

PDF

63.9 KB Created: 2021-04-07 02:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 722d76c175ed8c740de7341a6e93ec54 SHA-1: 48250dc71dcb55a2ff84dcf7183eb58232f970fe SHA-256: 16a862a92a0ec63a995b0e68324da7d3319f1e0e1fd31296a2fb749099615a4b
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'Banking syllabus 2019 pdf download', suggesting a phishing lure. The presence of numerous external URIs, many pointing to potentially disposable domains, further supports the phishing and link-farming heuristic. No scripts were extracted, but the overall structure and heuristics point towards a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7773

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 https://www.telluridescience.org/sites/default/files/tstc-applications/kuvusuwube.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/22206840813.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/fezijorimofilafomifum.pdf
    • https://www.jsif.org/sites/default/files/webform/meratasadif.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/tonitunivopevefasoxezaw.pdf
    • https://www.mainephilanthropy.org/sites/default/files/kimakevenowafuxopepasu.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/jebumimebugamoto.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/27804174203.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=banking+syllabus+2019+pdf+download
    • https://minorsoncampus.princeton.edu/system/files/webform/janoruzafasolefixos.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/44438097533.pdf
    • https://www.healthdata.org/sites/default/files/resumes/68382108709.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e099.bin
bea38a1a03bd94ba16cc77b11fd174b31ad98d47a231de55df02a304a3b5c263		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 6040 bytes

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