Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c382fe2bc3c6fa4…

MALICIOUS

PDF

69.8 KB Created: 2021-04-07 04:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb9affa17c7d19e2f7944eb8c22ba9af SHA-1: a4d0e92e5a0016bb8235ac802b40caf468f1a9c7 SHA-256: 5c382fe2bc3c6fa41f17d18be690b6180403c5e8f7a6a8323b09e2c8d9abe654
126 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or are structured as link farms, suggesting an attempt to obscure the final malicious destination. The PDF's structure and embedded content indicate it is likely used as a lure to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://cicatsalud.com/html/sites/default/files/webform/39809543560.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/bavowusakixonodokuja.pdf
    • https://ambrose.edu/sites/default/files/webform/52499587618.pdf
    • http://www.friendlycc.com/sites/default/files/webform/topevonizudurazot.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/loxigexaxezirizedud.pdf
    • https://www.visitsavannah.com/sites/default/files/webform/90994069376.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/xetomaroronep.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/99469138220.pdf
    • https://ambrose.edu/sites/default/files/webform/20598750849.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/29410319198.pdf
    • https://www.blplegal.com/sites/default/files/webform/25596831819.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/jevosofotabotasif.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/taxebuvokorutupimapo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=catalogo+hinode+pdf+2019
    • https://www.vub.be/sites/vub/files/webform/piwolumubixu.pdf
    • https://drones.princeton.edu/system/files/webform/66931006591.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_off0000d15d.bin
53adac9e3e9d4e457f822c8360321113900dd730edafb27a8b7a8c6312d6ca36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 5416 bytes
font_01_sfnt_off0000e3ca.bin
6598c6e607838ba357e8f2e32cee2964f1a4b5a1298e51de0939c6007af87bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 11956 bytes

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