Malicious PDF — malware analysis report

Static analysis result for SHA-256 a817fd9084c93efa…

MALICIOUS

PDF

59.6 KB Created: 2020-11-24 13:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e92bed4d205aee7fd9ef3c5a58584ce1 SHA-1: 3412e79b0c4d52dc058f28a2da3dd4a62db30f81 SHA-256: a817fd9084c93efa5755bac71d48a43bd0240522e63b942da3f92680d47fd32b
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ggraff.ru, which is indicative of phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URL suggest an attempt to redirect the user to a malicious site, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ggtraff.ru/strik?utm_term=object+pronouns+worksheet+pdf+grade+1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_5f94ad5fe1ba3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f932f469327f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410717/normal_5f9e70da9d50e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f876cc2f0cc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_5f9a42530ca04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477630/normal_5fbc687cb2514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490138/normal_5fbb76d9a20c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377936/normal_5fb9909e7eae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454673/normal_5fb574f1a12cf.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/babetafaperaxov/polynomials_with_imaginary_roots_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/intel_rapid_storage_technology_rst_service_is_not_running.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/ap_computer_science_2009_multiple_choice.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_off0000abd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD6 5836 bytes
SHA-256: 195426f7aad7066e54989e81a3fe81748a9d73feb5dddc3ced1700d0df44cb2b
font_01_sfnt_off0000bfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC5 9880 bytes
SHA-256: 88a2161c6e59ebf9b139f57f102e94a3dd6853f33dd30037ad8e339223a3dca7

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