Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d36cd028ba7a44a…

MALICIOUS

PDF

60.2 KB Created: 2021-04-23 10:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bebe7315aff08b4f338c8fbc1046bddd SHA-1: 02c547d50675eeaab2560a4401cface1a0eacf93 SHA-256: 4d36cd028ba7a44ab03459de6888eb8a8ca7bbb3cf163e6fbfb18d35872d0608
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. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of numerous embedded URLs, some pointing to potentially malicious domains, indicates an attempt to redirect users to external sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7709

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://russian-ice-spb.ru/sites/default/files/webform/files/loxigexaxezirizedud.pdf
    • https://ambrose.edu/sites/default/files/webform/seliruni.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/garuwofewitenobakufenewi.pdf
    • https://www.visitsavannah.com/sites/default/files/webform/nodarinit.pdf
    • http://spotlight-sites.com/sites/default/files/webform/loboje.pdf
    • https://ambrose.edu/sites/default/files/webform/gewematumupam.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/30150103061.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/sixativitav.pdf
    • https://ambrose.edu/sites/default/files/webform/vojowavujelosapol.pdf
    • http://portal-mysigma.com/system/files/student-proof/tevesifisota.pdf
    • http://portal-mysigma.com/system/files/student-proof/9555400870.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=caballo+de+troya+audiolibro+3
    • https://community.princeton.edu/system/files/webform/42655509772.pdf
    • https://campusrec.princeton.edu/system/files/webform/putiwokareviwe.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/27732669772.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ff.bin
3e44615afa03848f4b578df4851ec4b01ab09d52c339da183d89cdbf4049b4b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 4952 bytes

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