Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd9527ec99cce8e…

MALICIOUS

PDF

68.0 KB Created: 2020-12-22 12:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fb1a2f69014a455ca22c9b2660d35fd4 SHA-1: d6d438c118d5d393f248ee7f42005625cd062d58 SHA-256: dfd9527ec99cce8e1a80c2840c253e095d1bd91905f5ca85192f639b8d785110
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'trivia quizzes', aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=moviefan+idle+trivia+quizzes In PDF document text
    • https://static.s123-cdn-static.com/uploads/4375507/normal_5fc7ee1a77cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_5fad8e03ec838.pdfIn PDF document text
    • https://dorakipep.weebly.com/uploads/1/3/4/7/134747047/bexakenokij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470542/normal_5fc3a6350b377.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/782c0f54-fad7-4e3a-9641-2b44b04738b0/early_years_of_the_civil_war.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7cbbf1-0fec-47b7-881d-4427ed436210/geometric_measure_theory_a_beginner_s_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf485065288022f4f861ea/t/5fd0984a48ae4d1218053f60/1607505997862/free_things_to_do_in_williamsburg_brooklyn.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd2ade3278413528c85ff0/1606232799712/71145648834.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2ccd688c99b6d37b395bd/t/5fc7a66e9dfc2a404526fa33/1606919791437/saloxolowixivara.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc804350e6d73f00910ce2/t/5fdc936acf5edb70e29d8a3b/1608291179042/25611930415.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_off0000cad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD6 5140 bytes
SHA-256: 3b67083ff117bd54c05c96c16d57a70ecf651ef39dd33f8707f18c9d0666d894
font_01_sfnt_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 11728 bytes
SHA-256: 7e9330eb339cca4c9b04abc497f3af2b29ca6f7e8db6dbf41fea285ac103cf7c

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