Malicious PDF — malware analysis report

Static analysis result for SHA-256 712ca4b814dc4022…

MALICIOUS

PDF

70.7 KB Created: 2021-02-08 09:57:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0578b48fe79808d3293f00e9ede136c3 SHA-1: 79164e1f6460e95d4722ecb768e94731588bf4b7 SHA-256: 712ca4b814dc4022a79a49f8bdf9c2251ce55e614e9594ba61795991ef1abfc0
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV also flagged this file as malicious. Although no scripts were explicitly extracted, the PDF structure and embedded URL suggest an attempt to exploit users by masquerading as educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wb?keyword=physical%20science%20worksheet%20conservation%20of%20energy%20answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_601ef526249d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366341/normal_5ffb5c3283748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_6015bbe9d8525.pdfIn PDF document text
    • https://vugesajovor.weebly.com/uploads/1/3/4/2/134265649/jirupo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447107/normal_60031e094640c.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/TcBiijh/82139069842.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/gwWGbhe/7467256712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466146/normal_5fee0d4a52ca9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471474/normal_5fc5703675d0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_600cb4652ec5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484609/normal_5ffb31f34d3ad.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/ijGzi9e/nunolane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378381/normal_60045b136afc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5fdfeeb360e6b.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/abge8ig/21137593138.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/gapivegek/balance_charger_v6ac_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/97727410076.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/dashboard_template_free_html5_and_css3.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/que_es_el_analisis_del_discurso.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_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 5464 bytes
SHA-256: 08cf3a51ae7cf637fc934bb1668164c758640d00a0ef28806a547fbcb4f2c87a
font_01_sfnt_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 10572 bytes
SHA-256: 39b6aa3522916bade3a502301bebd41a06b39cbe06926bf31c065e62fb7400b8

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