Malicious PDF — malware analysis report

Static analysis result for SHA-256 5508ec7f98e368c1…

MALICIOUS

PDF

69.0 KB Created: 2020-12-31 17:46:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 85512e154b7b598272fbd947c31eee89 SHA-1: 5c9b2557e9da472a6404da9b152c080bb8060d47 SHA-256: 5508ec7f98e368c12a101d015aadda8a30eb2ee7035c40f795375593a74c7c43
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=best+stretches+for+dancers+to+increase+flexibility'. This URL is likely used to redirect the user to a phishing or malware distribution site. The ML classifier also flagged this PDF with a high probability of being malicious. No scripts were extracted, but the presence of a malicious URL in a PDF document strongly suggests a phishing or malware delivery attempt.

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://gettraff.ru/strik?utm_term=best+stretches+for+dancers+to+increase+flexibility In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_5fb92bbe617c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529149/normal_5fed40254f96e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_5f9aea12c7581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415964/normal_5fa9905cb3c8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5f87631f4c356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5fb2c8f3168e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f89026876472.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiderubota/hh2Mjdy/screen_time_apps_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5faf8a296c4f9.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/FIdhagz/rimadipiwalowukumetu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460060/normal_5fc7ff2983d0d.pdfIn PDF document text
    • https://cdn.sqhk.co/berovanova/ijhqQhe/how_to_make_a_spiral_rainbow_balloon_arch.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/f3d71a5b-a1e4-4c3d-a117-4d9c759f4b88/mr._alexander_physics_vector_addition_worksheet_answer_key.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_off0000d152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD152 5468 bytes
SHA-256: be2174cfe14b6d3ff4c4f1a027f89e73d95e5d3a4b004647c0eb601557f39140
font_01_sfnt_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 10304 bytes
SHA-256: 9340b6a4454d2036097591be0e452e2c09ea1aee848d5d0abce763064c2967d2

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