Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8fc43d9df64119…

MALICIOUS

PDF

66.1 KB Created: 2021-04-18 14:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 684e6c9175a5ad75a4fd23ccc14b63a3 SHA-1: 1ef546f6becef817551c7cd105c83400181f7117 SHA-256: 9e8fc43d9df6411948dbefd195c72b9c853f3df369b795e05efad5451817695f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains or are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.pbttphtk.gov.my/sites/default/files/webform/95941620813.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/72664382884.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/pagasumoxozodaxatukaliwus.pdf
    • https://www.jts.org.jo/sites/default/files/webform/96043924660.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/99469138220.pdf
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/newusagolepilukakatukus.pdf
    • https://ambrose.edu/sites/default/files/webform/42416127327.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/27017481005.pdf
    • https://www.afscme65.org/system/files/webform/96479551545.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+connect+philips+remote+to+vizio+tv
    • https://gradfutures.princeton.edu/system/files/webform/16157352895.pdf
    • https://www.vub.be/sites/vub/files/webform/pagilavamuvawasaxega.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5ec.bin
4f4c9111605aa4ef63606524f143782198795cb1c1b1cc4fa3c0d20910008d4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EC 5128 bytes
font_01_sfnt_off0000d752.bin
c64bd66a5090196dcd4fb4dcea699a9ec3f806801dae200a41735e5dc5b2564d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 10780 bytes