Malicious PDF — malware analysis report

Static analysis result for SHA-256 249af2ca23e790b3…

MALICIOUS

PDF

81.3 KB Created: 2021-04-07 07:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a3b2eab223621790c56ac02f02e28fb7 SHA-1: 785b2439946d32177eb6c284f6784d4bce75a401 SHA-256: 249af2ca23e790b3965916b1b1146d374d6e9f28b8ca15fddd73a129753a93bc
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable domains or link farms, suggests a phishing or malicious content distribution attempt. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://aboss.by/sites/default/files/webform/80384466065.pdf In PDF document text
    • https://www.natsihwa.org.au/sites/default/files/webform/xugapovapoz.pdfIn PDF document text
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/bariwogutal.pdfIn PDF document text
    • http://www.friendlycc.com/sites/default/files/webform/tojatovovezugunubi.pdfIn PDF document text
    • https://www.afscme65.org/system/files/webform/96479551545.pdfIn PDF document text
    • https://www.natsihwa.org.au/sites/default/files/webform/51762260361.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/juremetepatofuf.pdfIn PDF document text
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/pulipalukegibivep.pdfIn PDF document text
    • http://cicatsalud.com/html/sites/default/files/webform/90703453713.pdfIn PDF document text
    • https://www.jwico.com/sites/default/files/webform/66271497470.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/zateguzafafidefezibexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=autocad+2010+tutorial+book+pdfPDF link annotation
    • https://community.princeton.edu/system/files/webform/40347257249.pdfIn PDF document text
    • https://community.princeton.edu/system/files/webform/tujuxegagisezemesolut.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 4032 bytes
SHA-256: 1d890cbc49c86b194b6bea92bfd272c23f59aa3734dae7befebffe896f6f634c
font_01_sfnt_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 5492 bytes
SHA-256: faeeb4cdd87c57c9ad799f6c5b69241059c3717d9ff05d4f07c94cfb7ae8de89
font_02_sfnt_off00010f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 12084 bytes
SHA-256: 1773d52fecedd9cf8db102ec6a187339e3d0f89200dbb09b91e09b3183c1a6a6

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