Malicious PDF — malware analysis report

Static analysis result for SHA-256 510d91ffddd2cabd…

MALICIOUS

PDF

64.8 KB Created: 2021-04-16 19:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42907ace178751574e8188d2a24d784f SHA-1: e140d3599b9787e805191c5b896a9c126683b6b1 SHA-256: 510d91ffddd2cabdee5c862604b90cf58ccfd17aaaf6186f29b91d4d6fea0df2
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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 https://www.woonsocketri.org/system/temporary/webform/kebadewanizokodijixupid.pdf
    • https://www.a1touchsolution.nl/sites/default/files/kobovigub.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/38780162719.pdf
    • https://aboss.by/sites/default/files/webform/32639212941.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/geguridafaj.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/vonasajevevedatenalezeb.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/jedirokadezat.pdf
    • https://ambrose.edu/sites/default/files/webform/65047245793.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=la+riqueza+de+las+naciones+resumen+capitulo+10
    • https://www.healthdata.org/sites/default/files/resumes/nufimogunuzin.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/jawugu.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/wutiladerotegedubel.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/85266863194.pdf
    • https://www.healthdata.org/sites/default/files/resumes/sutuzosugogaw.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d426.bin
532cd02a769f58a4af7a8981317f9f64e10bcdb2d37ae0fbf858097a2192f9d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 5532 bytes
font_01_sfnt_off0000e6ea.bin
62c21f818084416d1dbeeae151977edbaf1176cc16e7a018fbefd3a57173f6d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 10468 bytes

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