Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e01819cc8c37f82…

MALICIOUS

PDF

76.4 KB Created: 2021-01-19 11:23:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 22e43bfaacbab8054bd174102b461b43 SHA-1: b35f1d32e64ef48ff262b5038f2719b61892370e SHA-256: 0e01819cc8c37f82cdf61a2aa4433ae64ff0a65e73392d6b89d2be13016f5c43
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing or trojan variant. The embedded links likely serve as the primary mechanism for delivering a malicious payload or directing users to phishing 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/123?utm_term=canon+fax+machines+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_5f910460812ce.pdfIn PDF document text
    • https://dijafujuzu.weebly.com/uploads/1/3/4/3/134369935/kafel-xufigedaxu-nokuxamomulu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379236/normal_6002415927598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_5fbca5239242c.pdfIn PDF document text
    • https://jozegolufipiz.weebly.com/uploads/1/3/0/7/130776065/4c0bb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_5fb7f706109d3.pdfIn PDF document text
    • https://lidutefavova.weebly.com/uploads/1/3/4/0/134012516/2437087a9b98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_5f8bb6ba6581e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/sixavunekikibuf.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/jubunowapegifudaji.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/xokazovelokomosimubadu.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/tidumusimuwis.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/25820424818.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/baixar_facebook_lite_apk_atualizado.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/aduro_solar_charger_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/ny_driver_manual_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 4996 bytes
SHA-256: b02051b6e17e290eb262f420a398665bff135c069b6d1271aa52f236ff02f3ea
font_01_sfnt_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 11088 bytes
SHA-256: 0149529b3f71a23b8169df8e44cbead5070d0bfb52750a86c50c2aea3a139d49

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