Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d04d2d8791f1c6…

MALICIOUS

PDF

76.7 KB Created: 2021-03-02 07:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 18d23f3f4de89daff37862310d18c8eb SHA-1: 836817f6a453377005f1af7ae0141946c9456f66 SHA-256: 55d04d2d8791f1c693cc4582c67a21eb38dede3b52ee8112cc4ff77b9ddc9b09
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'crophysi.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure the user to a malicious site, likely for phishing or to download a secondary payload.

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://crophysi.ru/strik?utm_term=how+long+does+carpet+take+to+dry+after+steam+cleaning In PDF document text
    • https://static.s123-cdn-static.com/uploads/4455669/normal_5ffb809d71061.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/OogFifP/best_slayer_master_for_hellhounds_osrs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_60260673d969b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fd7f8d506119.pdfIn PDF document text
    • https://cdn.sqhk.co/fazologim/vaibOgg/turbo_kit_for_2015_toyota_camry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482405/normal_6015c0054e21e.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/sopakeguvimexakun.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/harbor_freight_scroll_saw_vs_wen_scroll_saw.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/39906757325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_601916334fde5.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/gfjfh0B/39727192532.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxawexa/iijhKcG/nomokisetuleropatenowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fd6621300e8b.pdfIn PDF document text
    • https://cdn.sqhk.co/disarelas/jhfjcUE/towodiwikid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462732/normal_6005c6dde8552.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 5692 bytes
SHA-256: e66553cf3667144b20befb205123e9b9676f77151b021f3f17b96118b7c0e16b
font_01_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 10964 bytes
SHA-256: a3e5b8a9de059129c3497e88d4172253ed71694c4a7e7dfd5a10ab65cbf8e4df

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