Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce9b46a1a7e8018…

MALICIOUS

PDF

70.1 KB Created: 2021-04-18 12:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d07f9fc85bbaba43fcac826c4da0122 SHA-1: ae672197043d3d1dd4ee6e2efc569ebdf6686a1e SHA-256: cce9b46a1a7e8018d5ae4fa379111ccb1ef79f1308f389e13b3ede813e57f1c9
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 link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • 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 https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/tojawi.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/17423244846.pdf
    • https://www.dgs-interparts.be/sites/default/files/41094691834.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/77861868930.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/72664382884.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/bavowusakixonodokuja.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/dutaberapowuniz.pdf
    • http://spotlight-sites.com/sites/default/files/webform/sizewavajifur.pdf
    • https://www.a1touchsolution.nl/sites/default/files/wozupidojenebimovom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sistema+endocrino+pdf+resumen
    • https://minorsoncampus.princeton.edu/system/files/webform/vogifowisawab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c665.bin
befa30402f02f52bfe714521cd555df325108a06737d6c52dd6614e0229e24d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC665 5252 bytes
font_01_sfnt_off0000d81b.bin
5739776d4ff957a4656d8acf96c622916fb88ca354046b87eb1767167ac5bdc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 11288 bytes
font_02_sfnt_off0000fc96.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 4324 bytes

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