Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce72f1d6744d9e64…

MALICIOUS

PDF

83.5 KB Created: 2021-01-02 18:31:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8bbe9d3f495ed8a9b8c8210a67a332e8 SHA-1: bb1afb87232d8ae77be1ec07bfd76fb680135375 SHA-256: ce72f1d6744d9e64ade1c769670ee505bc529efb350be7768161fa52eef0438d
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, disguised with a search query for a school calendar. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded link suggest it's designed to redirect the user to a phishing or malware distribution site.

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://cctraff.ru/123?utm_term=stafford+county+va+school+calendar+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f9054be92c28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408720/normal_5fe0dbc01d253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_5f9cdbaa4f461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493578/normal_5fdfaa4fa0beb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478387/normal_5fed225011bef.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/b3c2229d-9b42-4acc-a9ad-f1971fb5bcea/39812405379.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/alesis_nitro_mesh_kit_manuale_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/consumer_reports_best_appliances_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e08e1a09-6a83-49ae-ac00-b6fa1b845e41/58922462803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b90d036-a6c3-45a3-9b14-7a13c8218d6b/geporekivufalugewok.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/photo_border_psd_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cdfbd7d-3006-4771-a40c-ff8f8f512e84/70195614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f794be-2bd4-4534-b731-7bd3d60358d3/4631305596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d93a042-7c4e-45cf-bbab-cc44d44eb1a2/maroon_5_songs_mp3.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_off00010607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 5856 bytes
SHA-256: 8563d25d4d2ec36cfe6278ef307c38ea109ec4912439711fd7b15dd922f5a955
font_01_sfnt_off00011a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A01 11516 bytes
SHA-256: 17d7f9e2412975819a41076bc0ff14edecaf216982b183a6eb65c72bc14af878

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