Malicious PDF — malware analysis report

Static analysis result for SHA-256 747ef3f4b8ab1111…

MALICIOUS

PDF

68.1 KB Created: 2021-04-26 23:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cfae6ba313923869ff777eb78cc6e84 SHA-1: c82b11eadfcfef2a5fd27fdff9230b27251287d3 SHA-256: 747ef3f4b8ab1111cec8c3243bedf2f93b6a416973a3c7a8fd0d4db98b4da191
124 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrusted sites. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

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://www.jsif.org/sites/default/files/webform/94808830073.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/tasuwagorefovufozibojer.pdf
    • https://www.a1touchsolution.nl/sites/default/files/73086307569.pdf
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/90877516301.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/nolukaronedibikix.pdf
    • https://europa-ts.ru/sites/default/files/webform/6529842099.pdf
    • http://spotlight-sites.com/sites/default/files/webform/razodogodipuvubetixem.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/zizepuniket.pdf
    • https://ambrose.edu/sites/default/files/webform/26147793628.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/32056102714.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=briggs+and+stratton+vanguard+16+hp+carburetor
    • https://lib.asu.edu/system/files/webform/liwubuwivak.pdf
    • https://campusrec.princeton.edu/system/files/webform/putiwokareviwe.pdf
    • https://drones.princeton.edu/system/files/webform/zifogisabivaloxigisosobu.pdf
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5d.bin
eaf50c5c1c3616891c0d00e141469e3faf3c5ee0c82c2fc0de397213b42eff73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 5760 bytes
font_01_sfnt_off0000ffee.bin
58b4873d33ac9fffaf45ed1a2312b8eb5fadf3b067e77f8cfe9e87095f6a7717		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 6068 bytes

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