Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19dde4fb5c81550…

MALICIOUS

PDF

68.1 KB Created: 2021-04-14 02:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: accb2db66ac099a30783a77f515c22d1 SHA-1: 9285f82c1344add10e6538866775db3801d95fb2 SHA-256: b19dde4fb5c81550a2a62e4d9361afb9f546d0d3a6a5174cb0ed835e2f4100b1
64 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 redirection scheme. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the presence of many external links and the ML detection indicate a high likelihood of malicious intent, possibly for phishing or distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8149

Heuristics 3

  • 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://ambrose.edu/sites/default/files/webform/fenalop.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/17184396690.pdf
    • https://www.blplegal.com/sites/default/files/webform/pifijolaj.pdf
    • https://www.uts.cw/sites/default/files/webform/vogoledifekotukedadawen.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/33269367294.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/32675510575.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/66890294103.pdf
    • https://www.uts.cw/sites/default/files/webform/dupoxemijuwavamuvugorudiz.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/fapulewamekunasu.pdf
    • https://ambrose.edu/sites/default/files/webform/vojowavujelosapol.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/1289321409.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=french+imperative+worksheet
    • https://thesanfordschool.asu.edu/sites/default/files/webform/99818817157.pdf
    • https://community.princeton.edu/system/files/webform/22535495660.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef12.bin
12401b18a6e00b7eb7c553ab3c52ea2ef0afeb3fbd3dbba03a3faeaf0517ca7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 5100 bytes

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