Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ee661b2e9c148e…

MALICIOUS

PDF

73.2 KB Created: 2021-03-22 15:01:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ee05bc3dce4ceb0ac92a5f0fe342f43 SHA-1: 7cb84313e58c6cec1b7d1c776f50e5814c35209b SHA-256: a1ee661b2e9c148e2942aa4f73930b40e50cebbbf401fa33403dc6309a3a6602
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 URL, https://botokaw.ru/award?keyword=kumon+addition+worksheets+pdf, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains text related to educational worksheets, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=kumon+addition+worksheets+pdf
    • https://cdn.sqhk.co/devisofage/cggl2Nu/monster_maze_runner.pdf
    • https://cdn.sqhk.co/doxanusubomo/WligidO/lost_frontier_menu.pdf
    • http://fepaporipevari.mypressonline.com/petojerur.pdf
    • http://rakapugijumub.sportsontheweb.net/how_to_move_a_dead_electric_golf_cart.pdf
    • http://nepoxiduvilej.scienceontheweb.net/46214414290.pdf
    • http://zakomuxoza.getenjoyment.net/autoclave_all_american_25x.pdf
    • http://sokuzise.iblogger.org/piseki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_00e80f01106e45bb9325677ed8dac86c.pdf?index=true
    • https://s3.amazonaws.com/zugutixe/majufapitavit.pdf
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_483571e316e144228cdf138383c9dde9.pdf?index=true
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_b3510f1af23b4de184d317846e5f36ad.pdf?index=true
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_daa9479467a7453c9d680ac4315c7679.pdf?index=true
    • https://s3.amazonaws.com/neporezofov/tri_fold_brochure_layout_template_free.pdf
    • https://uploads.strikinglycdn.com/files/e43c0398-3a6a-4e6f-9b31-14d790ec5c32/which_rat_had_the_fastest_metabolic_rate.pdf
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_d5927b78c1d34120a837167149d273af.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7a3165b8-7ab3-4f7e-a9b7-8f518c1923ff/leah_remini_troublemaker_audiobook.pdf
    • http://sidimusi.rf.gd/acofp_inservice_exam.pdf
    • http://zeroxezubanalil.onlinewebshop.net/propiedades_fisicas_quimicas_y_biologicas_de_los_materiales_dentales.pdf
    • https://uploads.strikinglycdn.com/files/3d94e5f8-abc9-4dbc-9198-7e012bb86450/whats_a_module_in_education.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_off0000e0a3.bin
5f019bc95feedf51e02f8db175494dbcef0178b81736df25dcae1eb0d9786fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 5376 bytes
font_01_sfnt_off0000f2d4.bin
96e3b80e66b7f6d9a79ed6987ecee7df8f7689166f3e83871577a6efee50e393		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 10828 bytes

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