Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1fdeb4336a70b7…

MALICIOUS

PDF

70.7 KB Created: 2021-03-16 11:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77ba292feba795f87f0d11e1bcb1bc15 SHA-1: 973bcf572fff6625c85f9adac402d24b1b6cbca3 SHA-256: db1fdeb4336a70b73f04ce382a89cc978d0ecf395998b551de9205c6ccf840f5
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://seumenha.ru/wix?keyword=fundamentals+of+nursing+study+guide+quizlet', which is likely a phishing or malware distribution lure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea of a web-based lure.

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
  • 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/wix?keyword=fundamentals+of+nursing+study+guide+quizlet
    • https://nisixokavenofaf.weebly.com/uploads/1/3/4/8/134891603/3815712.pdf
    • https://static.s123-cdn-static.com/uploads/4368501/normal_5fe3c2b2df35b.pdf
    • https://static.s123-cdn-static.com/uploads/4366976/normal_5fff6941dd078.pdf
    • https://cdn-cms.f-static.net/uploads/4401558/normal_6035a064723eb.pdf
    • https://cdn.sqhk.co/gukawaki/3icaIhf/4_pics_1_word_level_1866.pdf
    • https://cdn.sqhk.co/devuzemalut/ighgiea/josapibowetaderokorudixa.pdf
    • https://guzaxogovi.weebly.com/uploads/1/3/4/6/134651677/jumazot.pdf
    • https://cdn.sqhk.co/guzikiku/ziiOAVp/64865731381.pdf
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5fcef478cf9f6.pdf
    • https://cdn.sqhk.co/valujoper/hj5HIWb/4k_gaming_wallpaper.pdf
    • http://fajiriduxir.medianewsonline.com/41229703195.pdf
    • https://cdn.sqhk.co/kezavefizi/Lmghbhc/php_dynamic_ecommerce_website_templates_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ac2bfcdb-8ed5-43d6-bd06-c577c35200eb/53088652619.pdf
    • http://madepadejatutof.onlinewebshop.net/21604631305.pdf
    • https://uploads.strikinglycdn.com/files/946fa454-0335-4978-8eee-63eab0077852/ohio_state_university_visitor_parking_map.pdf
    • https://uploads.strikinglycdn.com/files/0e61c3a6-1999-4a7c-9a41-85bf804e56df/vodimilixu.pdf
    • https://s3.amazonaws.com/dorulusof/carrera_crossfire_2_hybrid_bike_manual.pdf
    • https://s3.amazonaws.com/fadupazageraf/vizesasezazodisake.pdf
    • https://s3.amazonaws.com/xalasawu/22820818847.pdf
    • https://uploads.strikinglycdn.com/files/308a75e3-95f4-4833-ba46-e500a56749b1/6210384417.pdf
    • https://uploads.strikinglycdn.com/files/eedff9f0-6f06-4e88-85cc-249d064ae9c3/lojodeweduzomebanotusudi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73e.bin
d5982c94eed3d1dd76411df3e5cc53e2b8d439ef1fd3e1a8338e5a80aad249fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD73E 5460 bytes
font_01_sfnt_off0000e9c2.bin
1226c79b952de944cd2645970ef5e573c23fd27371b057e426aea85f32a66bc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 10472 bytes

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