Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5ef59fefac2282…

MALICIOUS

PDF

70.3 KB Created: 2020-12-17 09:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 256f7aba04b3f9312a639f8596fa91ac SHA-1: e5568357cb0e22bb1190c51e47ae82bf6ba4a7c0 SHA-256: 4b5ef59fefac2282f3ba1cd50b3a0e33f7e942ea7b2ac03523c7cad034a16468
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://cctraff.ru/strik?utm_term=motion+to+dismiss+florida+civil'. This URL is likely used to redirect the user to a malicious site for phishing or to download further malware. 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 0.9997

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/strik?utm_term=motion+to+dismiss+florida+civil In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407777/normal_5fbfb287296d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f8b1e4a0069c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450353/normal_5fda2db367c02.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/34b8ed6a-e497-420a-ae1e-d39262167756/benjamin_pioneer_airbow_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83e9055-88a4-4856-86c6-c6df423cf792/uw_my_box_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9969d26e-8b1a-4f51-b3bb-3dbe5ae1da5b/simagope.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/vowid.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/xaraxufijejinojiligufed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85f44ab3-0214-47c4-a0bd-6372fcdffb6f/tera_online_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b2c917-89b2-484f-8e69-69099888ccb2/xokivevaratafaguzadek.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/taxonomia_de_carica_papaya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e878c0-350d-4d43-b930-bb3d64564641/ultimate_skin_installer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b09d4d-c743-4c8c-996d-d42bbfd37d2a/texes_pedagogy_and_professional_responsibilities_28ppr29_exam_study_guide.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_off0000d301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 5232 bytes
SHA-256: 6aa4ff154a9a35abfec694adfd66b8626dd3b003a735489d480edb8a6275fb94
font_01_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 11100 bytes
SHA-256: 5aac03249b1c0f7d81d3b8bc4fc5bce1eab4262e3524c0161c862fb61259e061

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