Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcef954d76991f29…

MALICIOUS

PDF

72.5 KB Created: 2021-06-08 13:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5e4ad76af365c47c477e9e7f3228342a SHA-1: 3df937add92fad99c0e799cdb97987ab9af1ca11 SHA-256: fcef954d76991f299a4270a74487d8142fba1cc265976a81bcbc43495a0edd23
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'seumenha.ru', which is likely the destination for a phishing or malware download attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI and the malware detection strongly suggest a malicious intent.

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/123?utm_term=corruption+game+school+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501810/normal_5fd3a336dc1d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_6019cb59aa258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495994/normal_602750d83cb95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469119/normal_5ff55b5311341.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387421/normal_5ff76a47ba925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_60ba8a1a53304.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4457281/normal_60b3bf1bcc257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5fe8283d378d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_602fca53e6d4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406482/normal_604e5d74e93e3.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/41cd9164-4156-4a77-b444-1975358b29e6/github_markdown_preformatted.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be916fb2-2c76-40e6-ae27-4174698b9849/giwamegaviluxi.pdfIn PDF document text
    • http://wejojixi.pbworks.com/f/man_of_the_house_veronica_gym_fight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c30e0922-a962-413b-82e6-b9509ceffde0/pesuzujejevetazikotupukix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c5f23ad-ffe2-4c31-85bb-f65804b8836e/48686486713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c7a58c-d515-4a8a-b27b-3b3f1894ee25/richmond_40_gallon_electric_water_heater_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9b14a8-f756-469a-a1c7-0513d16e5171/dental_instruments_pictures_and_names_uk.pdfIn PDF document text
    • http://vosebim.pbworks.com/w/file/fetch/144580113/picture_collage_maker_app_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2bcb1e2-6a31-4bc2-8559-2555acc4991e/is_100_cacao_healthy.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_off0000dc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 5392 bytes
SHA-256: d23fe60360c9fa41b60146d3662a7289ed5f6e1e01f26fb2d0dab9fa3516d97c
font_01_sfnt_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 11444 bytes
SHA-256: df484b881853fdf7243f658d20dd93eaa8a6c8be6eda0e0c8d39ffc80ea14fee

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