Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3724e3a87fa444…

MALICIOUS

PDF

60.4 KB Created: 2020-11-26 04:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8a0925bee67b7c4c2b50e2798a9cbcfd SHA-1: 77465b7b74717352a2bb1f878b59a107194dfe23 SHA-256: 7d3724e3a87fa44404c576aa690632a0fadae313dd211058a17da7774679182a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?utm_term=funny+halloween+cartoon+images'. This indicates the document's primary purpose is to lure the user to this malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence for a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/strik?utm_term=funny+halloween+cartoon+images In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377936/normal_5f8cf891c4ed6.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/piwanisaj/vabavukitasupa.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/novolog_insulin_sliding_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b054fd-5989-4837-bcb1-1a233337a5ef/fountain_of_sorrow_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/bugepejatarerutipenavor.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/cerebrovascular_anatomy.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/al_anon_service_manual_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/kafuxapajulesidukow.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/51778250688.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/sasurelibebijejoza.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/huo_yuan_jia_cctv_drama.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/28677267870.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/48511036001.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_off0000b3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FD 5364 bytes
SHA-256: 0b512a3e0cbe1e62cd89531c90770e5599b883a0ec59a5843b28a6169bd10a0a
font_01_sfnt_off0000c628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC628 8868 bytes
SHA-256: b811e36cf42db76573156f7ed48c7436f39b625d74d26c2c3c3dea17cfe5b4f3

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