Malicious PDF — malware analysis report

Static analysis result for SHA-256 a921599886319a64…

MALICIOUS

PDF

67.3 KB Created: 2020-12-17 00:11:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3d3c43d4b0d519003718dd8e525192ef SHA-1: 63e35d6ec3af5e91f8993173889722150b8837d7 SHA-256: a921599886319a64296a9a806c44f82173a628d80d7774bee24891c1c7f516a0
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://traffmen.ru/strik?utm_term=north+chicago+community+high+school'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://traffmen.ru/strik?utm_term=north+chicago+community+high+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_5fb32d6dca2db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489028/normal_5fbf44ac656ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f91b483bc14d.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/kofabube/sheetz_menu_healthy.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51b05c14dfd36fe0cbc2a/t/5fcc8d8ce43f2b00a8a27bb5/1607241102363/koxobalibozekoduwizuma.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/mp4_music_video_websites.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6e1b204a8c57c1486e423/t/5fd5f6b5ffab5d3c56ef3041/1607857846447/41583107264.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/fish_oil_supplements_benefits_for_men.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59a85bf71053ccb2fa840/t/5fcca0c0cded405bb8d3c7ac/1607246016428/wexetuvujoperekitadebopug.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50cb47d0c8f249d5ba047/t/5fc80e640b0ca147a56c3890/1606946406129/hidden_object_games_fairy_tales.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5a56f6b97992eb57bf598/t/5fd1b172ac13f65f66122997/1607577971469/musicals_listed_alphabetically.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/zia_rashid_kane_chronicles.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_off0000ca37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA37 5284 bytes
SHA-256: c02078e5548d79bda0dc6acb42236d65660c15d4749be6966de40475948e6eb4
font_01_sfnt_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 10736 bytes
SHA-256: 2ccad4470e081fa5551034e8568ed3a8dfa6f8026d7c7f3c122945cc003da454

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