Malicious PDF — malware analysis report

Static analysis result for SHA-256 a515f87a5686033d…

MALICIOUS

PDF

64.0 KB Created: 2021-04-13 11:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe088499b6719f31b9a72f30476b902d SHA-1: 08f15a901c48687c3fca768c7c876326b454bf38 SHA-256: a515f87a5686033de08b9fb6cc182d532bae89ca659cf784ee71cd40be28ef27
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

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://aboss.by/sites/default/files/webform/8474239295.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/38780162719.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/86947183128.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/dufadurelabakugozuku.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/26688185713.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/80982398497.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/danodajanenalidadalibebav.pdf
    • http://portal-mysigma.com/system/files/student-proof/47432021317.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/jebumimebugamoto.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/palepipob.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/72917344941.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/nuwirofu.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/fadubapep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=email+format+icse+class+10
    • https://thesanfordschool.asu.edu/sites/default/files/webform/moxogugudufagelo.pdf
    • https://community.princeton.edu/system/files/webform/fivedexexefo.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeec.bin
788b95f9a4469d328c2f4a0cdb64acf363cbc4758d10601a609f9dedbc4f630d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 5176 bytes

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