PDF malware analysis — malicious · 13aa8e512a4c4793

MALICIOUS

PDF

69.2 KB Created: 2021-04-16 21:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: bf84971eb19f8c02310400f023cd9698 SHA-1: 4ad6c605d630e54da97a6a3335c4ac47f5bedd11 SHA-256: 13aa8e512a4c4793c77407221160b331b9420a2691f296cc2ff68433e13add35

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 high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable or unknown domains, suggests a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9649

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.uts.cw/sites/default/files/webform/pugixenarewowu.pdf
- https://natsihwa.org.au/sites/default/files/webform/46250275999.pdf
- https://ambrose.edu/sites/default/files/webform/7968200385.pdf
- https://www.dgs-interparts.be/sites/default/files/55949953827.pdf
- https://www.jwico.com/sites/default/files/webform/23528315583.pdf
- https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/gurasijam.pdf
- https://www.pharoxglobal.com/sites/default/files/webform/50635107556.pdf
- https://web.liderpapel.com/sites/default/files/webform/dojoxopanikofogenag.pdf
- https://www.ofalloncasting.com/sites/default/files/webform/wibojamivumararevede.pdf
- https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/vawutudujenopudup.pdf
- https://europa-ts.ru/sites/default/files/webform/81905598419.pdf
- https://www.jwico.com/sites/default/files/webform/xojisipet.pdf
- https://ambrose.edu/sites/default/files/webform/lajeriz.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=roadmaster+bike+women%2527s+blue
- https://minorsoncampus.princeton.edu/system/files/webform/jawugu.pdf
- https://community.princeton.edu/system/files/webform/42655509772.pdf
- https://lib.asu.edu/system/files/webform/46247033309.pdf
- https://printandmail.princeton.edu/system/files/webform/54002061309.pdf
- https://minorsoncampus.princeton.edu/system/files/webform/97035559296.pdf
- http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ef65.bin` `405a93e89d57fc639217a36d7edc3accf78f97618559552cd53a9f5c1731bfa0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF65	5308 bytes

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