Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff87958eedcf042f…

MALICIOUS

PDF

72.0 KB Created: 2020-12-27 12:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3cd8f356eba004c37969502071bbba4c SHA-1: e728c6300e8ce47a66888ebd88cc2d1d42e9d4b8 SHA-256: ff87958eedcf042fdd5fb8368ebcc7081ce37f625d3b1ddd23efdb86dd7b0bb4
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 an attempt to direct the user to a harmful site. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ggtraff.ru/strik?utm_term=buy+contact+lenses+online+colored In PDF document text
    • https://cdn.sqhk.co/palazawu/fFjcihq/nail_salons_open_near_me_late.pdfIn PDF document text
    • https://cdn.sqhk.co/sisalubitot/U7rDQGt/timevexiregafokizud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5f889eeda2ea7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415292/normal_5fc9eba7460e5.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/pafiganovavi/koripepiwubabepip.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/26119197582.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/52520145765.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/71973067916.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/ctet_exam_previous_year_question_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/kimase.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_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 5084 bytes
SHA-256: 6a9b1c835f543aea2f02fd9fa40e6500c56b86767b97d24cd3b9f2071f16860a
font_01_sfnt_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 10852 bytes
SHA-256: a79c5416bc8c7beac00ca059ef11f61dd02ae55d4a6367a5ac09b4b0c5871e25