Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c59bf45a36c6f1…

MALICIOUS

PDF

64.0 KB Created: 2021-04-18 05:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 349126b5803e67a565db87779cf80a17 SHA-1: f8286870923c649b07d1e83b697ac5719c53d888 SHA-256: 48c59bf45a36c6f19c3469b434b6f561199bb5e1abc427bbb8b373b0fe6ad1a2
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm strategy. Although no scripts were explicitly extracted, the nature of the embedded URLs and the detection results strongly suggest a malicious intent to lead the user to a compromised or phishing website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

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.osgeurope.com/sites/osg-corporate.dev/files/webform/14219433733.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/99368311749.pdf
    • https://www.uts.cw/sites/default/files/webform/58994315224.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/34869944823.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/wibojamivumararevede.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/nuzutigurazuleziwuta.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/60015669747.pdf
    • https://web.liderpapel.com/sites/default/files/webform/21411595718.pdf
    • https://www.termis.org/system/files/webform/manejuwavujegajejumoxak.pdf
    • https://www.jwico.com/sites/default/files/webform/xojisipet.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/17232120942.pdf
    • https://www.uts.cw/sites/default/files/webform/50818196885.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dress+down+day+policy
    • https://printandmail.princeton.edu/system/files/webform/50156150340.pdf
    • https://campusrec.princeton.edu/system/files/webform/16616798570.pdf
    • https://lib.asu.edu/system/files/webform/dilitopuwivane.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e509.bin
0a539b9db19fad5ce01b7fb5a1324ef86b0ce804ae4ea3d54168f58d8b10799c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 5260 bytes

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