Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19fe0d5f3ac79d3…

MALICIOUS

PDF

62.5 KB Created: 2021-04-21 22:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec7e3d9b5f5226faa99e69df758820d SHA-1: 2847bd070b0a8181cc5e84165b516a17c242ba11 SHA-256: b19fe0d5f3ac79d3a188e25cdee6d9447da20c73f8d977ff06e93b702bd8eb36
124 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious domains disguised as legitimate resources. The PDF structure and embedded links suggest an attempt to redirect the user to a compromised or malicious website for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

Heuristics 4

  • 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.
  • 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://vectorcorp.net/sites/default/files/webform/resume/27999686052.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/xubapubawaral.pdf
    • https://ambrose.edu/sites/default/files/webform/9979090083.pdf
    • https://www.blplegal.com/sites/default/files/webform/julojulixizegusu.pdf
    • https://www.a1touchsolution.nl/sites/default/files/kobovigub.pdf
    • https://www.uts.cw/sites/default/files/webform/pugixenarewowu.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/13471650610.pdf
    • https://www.dgs-interparts.be/sites/default/files/7838369457.pdf
    • https://www.afscme65.org/system/files/webform/11173368180.pdf
    • https://www.uts.cw/sites/default/files/webform/89737617204.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/tefofavokalozigukar.pdf
    • https://www.jsif.org/sites/default/files/webform/54250685962.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/72664382884.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=california+common+core+standards+math+2nd+grade
    • https://community.princeton.edu/system/files/webform/xakefabobadu.pdf
    • https://community.princeton.edu/system/files/webform/40347257249.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/45540448673.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfeb.bin
9dcc029a1a71b79962e6617b99774ddaf0f04d86334a2c6a10d675d86e54b219		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 5472 bytes

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