Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d56315650f4e91…

MALICIOUS

PDF

73.6 KB Created: 2021-04-10 16:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14cb4425f810007e7946edb02e3c5ef9 SHA-1: c0a043bee50f30305258f6d34cac1f49366f98fa SHA-256: 52d56315650f4e917e5ae66306da03e7b92eb141e45178167a6cf0478f52450e
124 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7937

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://cicatsalud.com/html/sites/default/files/webform/93477879009.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/lewuxevibonotokezesa.pdf
    • https://www.blplegal.com/sites/default/files/webform/piselusani.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/85278691340.pdf
    • https://web.liderpapel.com/sites/default/files/webform/dojoxopanikofogenag.pdf
    • https://www.jwico.com/sites/default/files/webform/pagijan.pdf
    • https://aboss.by/sites/default/files/webform/zivexovoburowunaxomenip.pdf
    • https://www.termis.org/system/files/webform/vomijalikuwukilowerosi.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/sumeli.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/7486912807.pdf
    • https://www.termis.org/system/files/webform/manejuwavujegajejumoxak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=case+files+emergency+medicine+pdf+fr
    • https://printandmail.princeton.edu/system/files/webform/83401752781.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/5272012193.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf4.bin
f89f6cd20b0f1f2d0714cebe4816da15bb1aeedf358a9c8bcbbdc9524727ed1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 5196 bytes
font_01_sfnt_off0000fc88.bin
64fdc84e4f4208df1ee6d0078c6486f053df7d6f45e8ac17853a7b7d6b917894		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 10748 bytes

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