Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4105ed1c098a09…

MALICIOUS

PDF

80.5 KB Created: 2020-12-25 22:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 552f75bd506525f5a3a8f201bcf6edb0 SHA-1: 1d46093581ec1dd46c9a3d0678d49aae75ddea2c SHA-256: 7d4105ed1c098a0952da70326ae32c827126039c16e11040b79ccaca1394cbfd
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains references to 'Eco falling ball mod' and the wkhtmltopdf tool, suggesting a lure to download or interact with malicious content.

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://trafficel.ru/strik?utm_term=eco+falling+ball+mod
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f9b9953304b0.pdf
    • https://cdn-cms.f-static.net/uploads/4392220/normal_5fd18ce472892.pdf
    • https://static.s123-cdn-static.com/uploads/4423442/normal_5fc614f3ebe2a.pdf
    • https://cdn-cms.f-static.net/uploads/4392463/normal_5fb918e79a27d.pdf
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5fdc4fdb0d00f.pdf
    • https://cdn.sqhk.co/kitaparek/jOjjCS5/concordia_app_store.pdf
    • https://cdn.sqhk.co/pujapipiwat/geUcMgf/free_music_player_mp3_player.pdf
    • https://cdn-cms.f-static.net/uploads/4466166/normal_5fdc1ae364321.pdf
    • https://static.s123-cdn-static.com/uploads/4405945/normal_5fca4d52e3dbf.pdf
    • https://cdn.sqhk.co/sogupavetut/R2FPHm5/daburoj.pdf
    • https://cdn.sqhk.co/baxafapunubi/Op2hb5f/27155021114.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nujosuwemedadi/letter_to_my_executor.pdf
    • https://s3.amazonaws.com/zazelujeju/constant_velocity_lab_answers.pdf
    • https://s3.amazonaws.com/wukevirenesu/recette_mystique_pour_attirer_l_argent.pdf
    • https://s3.amazonaws.com/lorerexeg/patotebawuminalemaxutilel.pdf
    • https://uploads.strikinglycdn.com/files/3bf5a42a-4d6d-478a-b50f-9cfcf099b47d/kick_out_kim.pdf
    • https://uploads.strikinglycdn.com/files/410cfffd-bd2d-44e7-9fa3-e99fe9497f25/ectomorph_muscle_gain_workout.pdf
    • https://s3.amazonaws.com/henghuili-files2/silabas_tonicas_y_atonas_ejemplos_para_nios.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dddc.bin
6dda4eba1ee9c89a6612ed5feb68d1791b343c18c5e8c51670af71a0ef67c4c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 5164 bytes
font_01_sfnt_off0000ef63.bin
606a17ea6b577f311de6fbb28947d9f7a9db7d33d64d2efe6c5700500afc2fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 15784 bytes
font_02_sfnt_off00011faa.bin
bfd5fcdb7495bed175e4f51938194e2ecb7e505d90535bc2124716332a04a4ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 16076 bytes

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