Malicious PDF — malware analysis report

Static analysis result for SHA-256 0364c5d19d1b2d35…

MALICIOUS

PDF

99.0 KB Created: 2021-05-30 05:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f54d11bc1c7f8faeb89ec98b815e8cdb SHA-1: e99dbaf68c5fd835150797c5d62fd9b832c8f2a9 SHA-256: 0364c5d19d1b2d35db14c4a897fde3af62e3ef7ed70e1646e1c6ee215ab77012
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL. This URL is presented in a way that mimics a search engine result, likely to trick the user into clicking it. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. No scripts were extracted, but the presence of the malicious URL is the primary indicator of compromise.

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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/strik?utm_term=nelson+mandela+long+walk+to+freedom+class+10+summary+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366057/normal_6009146e58bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_600bd8c5c057f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391317/normal_60489703974ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404975/normal_6004f3aa3dfd9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4501486/normal_60b270060d2c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455374/normal_604664757bcd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451374/normal_5fcbcb1e14c79.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/a68250e6-b728-4f55-b00c-11acf91b27a9/lefofevonuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b531a043-11e9-4e73-bbc1-74b373488914/bad_parking_coloring_turtle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084e5303-0924-4dd7-88d8-4ab9f472e24a/como_terminar_con_una_relacion_de_amantes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/095358fa-765d-4d03-8bcb-357054f49b5c/what_type_of_alphabet_is_russian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/241dd36b-af29-4753-aacd-8b4c1e71c343/what_does_cirrus_clouds_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d5fda69-81fa-4e63-8f2c-2ec4f4c86e0a/mojejoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95c8634-84f0-43b2-965b-1c97be416c9a/nusig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f92461fa-d1cf-4c16-9f3d-33fd5ca22cbb/are_employees_required_to_wear_masks_in_ohio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8efe84ee-e068-4e5f-806e-2ed3aec0f9d5/how_to_apply_for_medicaid_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ba5afd-bcad-4832-a0f6-bcb5e0d77c78/35441912841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b07b2f4-eb67-4d33-8a50-6953260ecb62/xozuxutadujoxakojorefozaz.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_off000142ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BA 5896 bytes
SHA-256: 3d8e5e97ec43f3f10d175d004be080543190d4d66b5a89e6863d8a467150222a
font_01_sfnt_off000156dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156DC 11300 bytes
SHA-256: 08957b319aeb1a2f8bdfbacc366d25ba42047c091b32e431b6f0a315f17d68a9

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