Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2ad5d0ebde8004…

MALICIOUS

PDF

88.8 KB Created: 2021-03-29 03:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 92cb30d90019539415e5d7ce53c8ea68 SHA-1: 54f0e8e832ffdc3653615f23af01ba346723b5e6 SHA-256: da2ad5d0ebde800442df7c79bcc3e121f207c2e4119dfa43c25ef6e8b6097d35
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a link to known malicious redirector infrastructure, specifically pointing to 'dafemum.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest this document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://dafemum.ru/123?utm_term=battlefront+1+2004 In PDF document text
    • https://cdn.sqhk.co/zinumazak/hliigj9/dentsply_cavitron_select_sps_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_6023f9fcc5f79.pdfIn PDF document text
    • http://kprovk.xyz/what_are_the_different_types_of_flexibility_trainingyfj53.pdfIn PDF document text
    • http://connexion-amelii.xyz/flight_simulator_plane_s9bltm.pdfIn PDF document text
    • https://cdn.sqhk.co/bivotiboma/kygc9hi/61871288066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387052/normal_60100dd9b9685.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422918/normal_5ff5ae31e4901.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452612/normal_5fee69d7d4a25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_601227093b552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_605c611c3935e.pdfIn PDF document text
    • https://cdn.sqhk.co/gisopagipize/gxigjb3/tumomuzenokufi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449768/normal_5ff60595eb9a1.pdfIn PDF document text
    • http://plafond.xyz/940482300545xoxq.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/hfPyihQ/fobifezoxifir.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/gdfijbi/93294917948.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1db8340-7fec-41b0-97c7-26c0edc80a72/los_30_derechos_humanos_universales_lista.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68264bfb-7e41-4b85-8e5d-5fe7057e7072/ref_code_s0900_comcast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2b674f-4c67-4782-96e5-1615aee87c1b/23483021068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51505564-7301-431a-a7d9-69b1c25cf925/fazakomidavizefukuzulevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0643c82-c38e-4283-858e-859781cdad2a/how_to_change_vivint_thermostat_to_heat.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_off00011e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7E 5048 bytes
SHA-256: 8a668cbd7e63a07ad557c3a0c56a6df9bc1a642c24ae7f6ad1d01761e7153350
font_01_sfnt_off00012fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBE 11432 bytes
SHA-256: 92944fd00adfc8728e67eaeb56bc0420a085f9820de7db6f1f5ed90137b758f9

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