Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39d628e892e82f4…

MALICIOUS

PDF

77.3 KB Created: 2021-03-13 18:11:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d671bda1d62843da436b9254cd3dc14 SHA-1: 348e08a9400ff4e932f94193d53e37ca626fabcd SHA-256: f39d628e892e82f49ccbce636cc85e8eb292501265b7c0a41e27e8e71c774535
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to 'algorithms' and 'solutions pdf', likely a lure to entice users to click the malicious link.

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://dafemum.ru/award?keyword=algorithms+4th+edition+solutions+pdf
    • http://baby-slings.ru/mnemonica_on_the_memorized_decky88b4.pdf
    • http://mivetys.xyz/que_significa_una_pulsera_roja_en_la_mano_izquierdaop6ss.pdf
    • http://chambrely.xyz/the_voter_chinua_achebe_questionstwilk.pdf
    • https://cdn.sqhk.co/baxotonad/ifgepjg/pixel_art_theme_noel_maternelle.pdf
    • http://reawont.online/zigalape0bb26.pdf
    • https://cdn.sqhk.co/genizataxom/3icrhea/spelling_bee_games_for_5th_graders.pdf
    • http://kino-vezde.ru/569047368621j0z4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_71a7fb6635244ad384896eef20a4faee.pdf?index=true
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_8caa9702be1d43ddbf3526f637ffb4ba.pdf?index=true
    • https://s3.amazonaws.com/jipowumat/all_stephen_king_books_in_order.pdf
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_de8086ed78af44a18ea54fbc69adda19.pdf?index=true
    • https://s3.amazonaws.com/lezerawe/nodojewifezosujurosow.pdf
    • https://uploads.strikinglycdn.com/files/b468df51-96d5-4e8c-8d67-85b9c7035881/bidixokun.pdf
    • https://uploads.strikinglycdn.com/files/e4ebda6e-0bd8-4d9c-97a7-582cb9ef100c/who_plays_robin_in_man_about_the_house.pdf
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_a80bd5db5c37438fb2df27ca05673a61.pdf?index=true
    • https://s3.amazonaws.com/tarajix/40249888052.pdf
    • https://uploads.strikinglycdn.com/files/bf601934-bf7a-4156-ab0d-d5b4143483a6/how_to_clean_a_crock_pot_express_cooker.pdf
    • https://uploads.strikinglycdn.com/files/69f1580f-ee8c-4604-b91d-9a8cbc7678d0/pojusumijisuzuka.pdf
    • https://uploads.strikinglycdn.com/files/7f074161-6a12-4d0d-8d1c-42a35b2705be/topics_under_covid_19_in_the_philippines.pdf
    • https://uploads.strikinglycdn.com/files/c9c45728-92a7-4e31-a282-3f160a193ca0/66626581631.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_off0000ef57.bin
6d97ebf2245a36bbc3594db9bf8d55aede09d1c00e3fc8316efb7c67162bba30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 5324 bytes
font_01_sfnt_off00010150.bin
ce5db0dbd8f4b75adf5a2dfd2d070d539f1840752eb3b1710e46507a323a2f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 11556 bytes

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