Malicious PDF — malware analysis report

Static analysis result for SHA-256 862a9bbff8fa8843…

MALICIOUS

PDF

67.2 KB Created: 2021-03-08 19:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 1507630a2bf7da32ca94046770e02a91 SHA-1: ae92caf4f213b81a87bf22a900b6afc97372b883 SHA-256: 862a9bbff8fa88437fd64ffa11e583cf6208ca46529c2f5988dc394f039aaed0
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to 'https://seumenha.ru/strik?utm_term=med+el+sonnet+parts', which is highly suspicious. The document body is heavily obfuscated, but the presence of the external URI strongly suggests a phishing or malware delivery attempt.

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
  • 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=med+el+sonnet+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451750/normal_5fd85e920f2ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5fdaf08f2ec79.pdfIn PDF document text
    • https://cdn.sqhk.co/zadexona/siiji0N/purusejerekij.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/3v7hfgc/naselixasur.pdfIn PDF document text
    • https://cdn.sqhk.co/vuguvorexi/ipifghb/16058372946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_5fd991a3d4970.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/hjIc2MS/viridian_color_mix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lurorozowuwa.rf.gd/91852525933.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_d3517f9bf21e4379a4c9746c8bcdbae6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/16130351438.pdfIn PDF document text
    • http://puxugizotivevi.epizy.com/38449285574.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/blender_2._78_32_bits.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/97181730080.pdfIn PDF document text
    • http://jigabez.epizy.com/12863995737.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/latest_whatsapp_for_blackberry_10.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_415ca344e26a4ee1bbfe6b88414c220b.pdf?index=trueIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_a8a0982f528d4c31bf7c0b9e06ade02e.pdf?index=trueIn PDF document text
    • http://bikikifuxax.epizy.com/what_are_the_best_exercises_for_upper_body_strength.pdfIn PDF document text
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_1610624bd71341d7ada497a6d0c58db8.pdf?index=trueIn PDF document text
    • http://wimidisa.epizy.com/tirumav.pdfIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_ab9b8d410c5c49a88355e7a00da6f11c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/borland_c_compiler_free.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_off0000cb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1A 4960 bytes
SHA-256: 409be5edcce3e7acf3bcfa5f469b0f25681fb2410e466e5fbb5de026993c5a07
font_01_sfnt_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 10460 bytes
SHA-256: aa8f1e445c0dbc506a565a2cbab852349afcc04cfbc2187d86c02d330135f595

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