Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee7763262dd4ad3…

MALICIOUS

PDF

70.8 KB Created: 2021-04-07 05:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df4028010025ed1b6d08c12b2b2d24c5 SHA-1: ad1548bbfd0cd5d87674e6325b814d5a6b9cf986 SHA-256: 8ee7763262dd4ad35482698242f4e9ce0a2ea6a84b571a3f5e14dbfacc38e896
124 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to host many links. While no scripts were explicitly extracted, the PDF structure itself can host malicious JavaScript, which is often used to redirect users or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9571

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://www.muttypawsacademy.com/sites/default/files/webform/vaccines/2944445507.pdf
    • https://ambrose.edu/sites/default/files/webform/fenalop.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/jebumimebugamoto.pdf
    • https://www.uts.cw/sites/default/files/webform/nufideleze.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/bedadijone.pdf
    • https://www.newburghgroup.com/sites/default/files/webform/resumes/mogewewe.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/41850888982.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/79062027218.pdf
    • https://www.a1touchsolution.nl/sites/default/files/kobovigub.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/32020734574.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/powevalixerofewum.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/43600748611.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=celtic+alleluia+piano+pdf
    • https://lib.asu.edu/system/files/webform/bidemuf.pdf
    • https://lib.asu.edu/system/files/webform/vabomabexajamoja.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f91f.bin
8d034e165f8a7f45917efdc689f3ce72d71b4a5d09a5aadb9796ff401e77d8d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 4780 bytes

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