Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcbc5176a0ef17d…

MALICIOUS

PDF

70.1 KB Created: 2021-04-19 21:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed0669e89dba27b8d35c9eabe15b3a12 SHA-1: 94bd0561055dcfcab86d50241a73fec272d43ddc SHA-256: efcbc5176a0ef17d03e2f38e81ace2cccbb7d0971cf1a0173f4ff6ea4989da9c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document contains numerous embedded URLs, many pointing to seemingly unrelated domains, suggesting a link farm designed to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or redirect users to malicious 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 https://architecturaldesigninc.com/sites/default/files/bujepalifomi.pdf
    • https://www.uts.cw/sites/default/files/webform/50818196885.pdf
    • https://www.termis.org/system/files/webform/dexifivoneput.pdf
    • https://www.visitsavannah.com/sites/default/files/webform/71260674720.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/foxegedukob.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/30253637425.pdf
    • https://www.blplegal.com/sites/default/files/webform/vogelunejubujapezidugave.pdf
    • https://aboss.by/sites/default/files/webform/vobefoxejajizagosoberob.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/subeditanutojodojewogize.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/27017481005.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dyson+ball+animal+plus+brush+not+spinning
    • https://community.princeton.edu/system/files/webform/setokan.pdf
    • https://campusrec.princeton.edu/system/files/webform/18758627140.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/68876097481.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/9071701793.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_off0000d54b.bin
9241052d04b04a1a8b9f0a584ab709443e76801ab6ea26028938f67c76750ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 5476 bytes
font_01_sfnt_off0000e7c6.bin
0988a2c164bee1323cfd379c84976ebccc75031775cb589846c33607acf1a2e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 10444 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.