Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ae1f8fb38cef2e…

MALICIOUS

PDF

61.1 KB Created: 2021-04-22 09:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24f41a6867d4881d0abaf2723a2909e8 SHA-1: d0d6388e4e035c2b21fc1adeb60373a4d08220a9 SHA-256: 24ae1f8fb38cef2e4d130ca872e1800a54e9f32936b99b21e96f980d3c1ecd26
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous unknown URLs suggest a link farm designed to redirect users to potentially malicious sites. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

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://oaklandchildcare.org/sites/default/files/webform/41266633523.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/96392425525.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/40110328039.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/basolidigululaba.pdf
    • https://www.mainephilanthropy.org/sites/default/files/5296457674.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/bedadijone.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/71502920023.pdf
    • http://seiary.com/sites/default/files/webform/rec/netugapufuzutazegiwiwivi.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/70037852461.pdf
    • https://www.mainephilanthropy.org/sites/default/files/30695142459.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/32056102714.pdf
    • https://www.jsif.org/sites/default/files/webform/54250685962.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+photography+books+for+beginners+reddit
    • https://lib.asu.edu/system/files/webform/midari.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/tuvoluxasivawujunaz.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/xegenaxug.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d75f.bin
2452aafb98e87bc8e53d0a15cd74afbebc005e84526f452eddc2d6ab2603275c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 5412 bytes

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