Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f7ae48fe5c53b6…

MALICIOUS

PDF

75.0 KB Created: 2021-03-18 00:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 532b3b3c934c7ecb2d1a553db655820a SHA-1: bc9c378fbe408b1278d88b2aa465f1d166b6749d SHA-256: f9f7ae48fe5c53b6eb39037409d844eb968ee315508132af473269e32e38e0bb
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to 'vilenefex.ru' which is likely part of the malicious payload delivery. The presence of a visual download button heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/strik?utm_term=factorytalk+view+site+edition+server
    • https://cdn.sqhk.co/tusujoxaseru/gjichcn/world_war_ii_quiz_questions.pdf
    • https://cdn.sqhk.co/pujixefan/idjaSTh/kotuzenakuduxogejewilax.pdf
    • http://itasda.online/33793467537ajjrs.pdf
    • http://select-get.top/61556507905dyjs4.pdf
    • http://galosidijixiwu.mypressonline.com/abstract_noun_worksheets_for_class_4_with_answers.pdf
    • http://podeves.xyz/avery_cd_label_templatesp9lok.pdf
    • https://sudiduku.weebly.com/uploads/1/3/1/4/131452825/68004d344d87.pdf
    • https://cdn.sqhk.co/worijekegir/pfKOdtU/chipping_campden_school_uniform_list.pdf
    • https://takigufumugo.weebly.com/uploads/1/3/5/3/135345847/bekulove.pdf
    • http://masterpowerpoint.com/dell_u2419h_user_manuallwjgf.pdf
    • http://lebizifijafaxim.medianewsonline.com/zuremibawi.pdf
    • https://cdn.sqhk.co/viwedanej/cqcMjfE/online_bike_racing_games_with_friends.pdf
    • http://normab-id.com/6737689306fjo5.pdf
    • http://wosedumuf.mywebcommunity.org/beps_action_3.pdf
    • https://zebonusifok.weebly.com/uploads/1/3/4/5/134509505/zixud_pasepitug_najeluwozulitu_teridobota.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5efef2ec-084b-4099-9c03-55777b55a399/lukowaretorolevepu.pdf
    • http://mojozore.myartsonline.com/5155766201.pdf
    • https://s3.amazonaws.com/vezumobigodub/hp_laserjet_p4015_parts_list.pdf
    • https://uploads.strikinglycdn.com/files/f986fda9-6212-474b-a4d3-87d04648bb90/hopeless_colleen_hoover_amazon.pdf
    • https://uploads.strikinglycdn.com/files/c9d16cd1-7c8b-4103-ac33-1e10096a1453/el_proceso_de_una_investigacin_cualitativa_es.pdf
    • https://uploads.strikinglycdn.com/files/d5fd55df-468e-4277-922e-58e031927de7/organic_chemistry_janice_smith_solutions_manual.pdf
    • https://uploads.strikinglycdn.com/files/51f30585-f9eb-41e0-a00f-a019d9e04cf4/the_metamorphosis_summary_chapter_2.pdf
    • https://s3.amazonaws.com/fogibi/ipod_nano_7th_generation_price_in_india.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_off0000e711.bin
f50308e1e2f3bc2b9320c6c51a16a39c22a003d347da8b5c95a8e57b78dec895		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 5208 bytes
font_01_sfnt_off0000f8f2.bin
4dd9962b21877f5d5b56c90c59c5fafcc6a7c1b90642d6a6d9c29794f4b46914		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 10896 bytes

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