Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2e135e631c1d77…

MALICIOUS

PDF

57.1 KB Created: 2021-04-14 08:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b1e9607c76d0deae4bac774968b5345 SHA-1: bccfe780c7c3142ca5ff43622fe3fc597780ce58 SHA-256: 4b2e135e631c1d7761a0ef77524e24bd1d3f08afb5ea5218223a907343abe6f9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified 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 hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document for this behavior. While no scripts were extracted, the presence of many external links and the overall detection profile strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8412

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.osgeurope.com/sites/osg-corporate.dev/files/webform/vonasajevevedatenalezeb.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/zavemazawutojene.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/1289321409.pdf
    • https://www.woonsocketri.org/system/temporary/webform/bogobovimefegaf.pdf
    • https://www.jwico.com/sites/default/files/webform/49109440539.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/kuvusuwube.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/wajuso.pdf
    • https://ambrose.edu/sites/default/files/webform/85138354947.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ernest+holmes+free+ebooks
    • https://printandmail.princeton.edu/system/files/webform/21250884575.pdf
    • https://printandmail.princeton.edu/system/files/webform/54002061309.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/ruwitik.pdf
    • https://www.healthdata.org/sites/default/files/resumes/68382108709.pdf
    • https://community.princeton.edu/system/files/webform/tujuxegagisezemesolut.pdf
    • https://lib.asu.edu/system/files/webform/dilitopuwivane.pdf
    • https://printandmail.princeton.edu/system/files/webform/21338807989.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d635.bin
3e4e17b6ee7d54655944e88eee97582c372f9e94d5e992277429c32e5181a81c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 4960 bytes

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