Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0b594e406e02b9…

MALICIOUS

PDF

69.5 KB Created: 2021-02-17 03:37:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 395418d4e92a0e8458abc71503c10a37 SHA-1: c2bce2b160dd1042353603157224fec4c980c8b8 SHA-256: eb0b594e406e02b94cecfab296541b8e69ca5a954b13e567890d7967ba43aba7
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, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or potentially malicious domains, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of external URIs and link farm characteristics further supports a malicious intent.

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 https://leonvi.ru/wix?keyword=vista+feed+store+vail+az PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487432/normal_5fda85e1c6e16.pdfIn PDF document text
    • http://zowuzigokov.22web.org/bubble_wings_offline_bubble_shooter_games_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/aicifha/moserezanezadiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_601cb8f2f0fc8.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/cRFjfha/talking_tom_gold_run_cowboy_angela.pdfIn PDF document text
    • http://nogivubuleduwi.22web.org/gosezamuxuvaxezukakujef.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/Phegija/amazon_seller_support_associate_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5ff4d7e472f10.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/6jalPgi/29220764969.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://getetir.epizy.com/27288668697.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/kumakonopikexelowejezewak.pdfIn PDF document text
    • http://muwaziri.epizy.com/aia_hk_dental_claim_form.pdfIn PDF document text
    • http://kunasajijujaf.rf.gd/jovomulezan.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/54438501529.pdfIn PDF document text
    • http://koxosam.rf.gd/algebra_1_unit_2_functions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/84242675331.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF01 4976 bytes
SHA-256: 9646f68cf57035b48627e59e1c5daf0095088471862f6a1f19eafad8223ebf6f
font_01_sfnt_off0000d00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00F 10392 bytes
SHA-256: 205257c29bd8ad4edecaadd709b032c02b4f2406131e00e90b5182f2a9b5050e
font_02_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 16164 bytes
SHA-256: 3afbc95f4a2677bf4c8b77bd7df62e4dbeb651db4b5e482cf97b58e472170d58

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