Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab4c2be17bab0c5…

MALICIOUS

PDF

74.0 KB Created: 2020-12-26 05:37:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ad58b71fbb6e0c27628e8a0260224131 SHA-1: 9bbbe6714cd964a1f08b0c34ba062b24e69da778 SHA-256: 5ab4c2be17bab0c512c244afe638d28c5e9943f6bb045f90840bceddabfb81e0
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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://gettraff.ru/strik?utm_term=joint+birthday+party+themes+for+boy+and+girl'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is sufficient evidence of malicious intent.

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://gettraff.ru/strik?utm_term=joint+birthday+party+themes+for+boy+and+girl In PDF document text
    • https://static.s123-cdn-static.com/uploads/4447888/normal_5fc4bee847975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482207/normal_5fb49110d5299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_5f9cd8ee84771.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485322/normal_5fd075369999f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5f8789a2832a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426062/normal_5fdfddc9cfe92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481056/normal_5fc9e8a26c54d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/35e2588b-85a2-4ed0-99aa-604e2fd6b752/kaferodaxewowiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc48fda-b884-4e5a-a2aa-e8093605ee13/3083769318.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/bulk_documents_from_sharepoint_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/mugaseruwonegivoruzogan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de6bdac-d8e0-4782-965b-7b2f917b6123/jabigukipibax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 5476 bytes
SHA-256: 9ca91e9040378cd0ef695f02ff4a2aa1ca68039a2fcd3d1ec4a178bf6e71d35e
font_01_sfnt_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 10916 bytes
SHA-256: 1f7f5ea719e8afcf07305656c81f9f2757f66659bc85642a6ad9243f8f3ffd03
font_02_sfnt_off00010cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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