Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4fa090dded2353…

MALICIOUS

PDF

83.4 KB Created: 2021-03-28 12:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c70075de1734ba99b9e6e35badab000 SHA-1: 4fd3228e792735090865d3066b88e2566e2bddfe SHA-256: 4a4fa090dded2353b01dc35914f392b4cf2e0f17a41e8fdbaa681a985ab9cba7
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, which is a strong indicator of a phishing or malware distribution attempt. ClamAV detection and ML classification further confirm its malicious nature. The document body, though heavily obfuscated, suggests a lure related to an 'award', likely intended to trick the user into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://kuzutuzo.ru/award?keyword=infusoria+culture+pdf
    • https://lumurali.weebly.com/uploads/1/3/4/6/134640239/9464077.pdf
    • https://cdn.sqhk.co/ribobujir/jeImOhe/76732953012.pdf
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5fd2d46b2d841.pdf
    • https://cdn.sqhk.co/niturunajik/IYPKhgD/draw_a_stickman_sketchbook_online.pdf
    • https://cdn.sqhk.co/sujubowip/hmrAxjf/magic_tape_waterproof.pdf
    • http://xulenegutuwovi.iblogger.org/department_exam_answer_key_may_2019.pdf
    • https://cdn.sqhk.co/jebavimot/ehihhia/call_of_duty_companion_app_doesn_t_work.pdf
    • https://lojanoper.weebly.com/uploads/1/3/5/4/135400197/xedakimefesosuzekod.pdf
    • https://cdn.sqhk.co/gipekoma/dmEnDhb/jobegojifidopepenege.pdf
    • https://cdn-cms.f-static.net/uploads/4447649/normal_601e79cec6226.pdf
    • http://widuzuduzudovix.iblogger.org/spelling_words_for_3rd_grade.pdf
    • https://static.s123-cdn-static.com/uploads/4370275/normal_5fca44926fb17.pdf
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/fa19fe0.pdf
    • https://cdn-cms.f-static.net/uploads/4369191/normal_60325299299a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6f6dd045-d9de-44c1-a69f-025397a627b4/what_size_file_do_i_need_for_a_stihl_.325_chain.pdf
    • https://uploads.strikinglycdn.com/files/bcab444b-4e31-4e1e-8e21-4d6696bad25b/which_of_the_following_is_not_a_characteristic_of_managerial_accounting_information.pdf
    • http://toxukofotu.rf.gd/tinewijewilojolatukazudar.pdf
    • https://s3.amazonaws.com/rojalexipokadaz/kcet_online_application_2018.pdf
    • https://uploads.strikinglycdn.com/files/956b62e7-a1d3-4d82-9416-92859cbdd06d/kukarinikisamab.pdf
    • https://s3.amazonaws.com/dukajevo/annual_general_meeting_notice_format.pdf
    • https://uploads.strikinglycdn.com/files/9a7bf741-4228-4fa9-81e0-a8936a10ed3a/how_to_cook_steak_fries_in_air_fryer.pdf
    • http://tafinefonekon.rf.gd/astringente_definicion.pdf
    • https://s3.amazonaws.com/wazotojemov/givowoso.pdf
    • https://s3.amazonaws.com/faxaxos/mokurejutevekakuwijikol.pdf
    • https://s3.amazonaws.com/mubefula/tamefanolibuwot.pdf
    • https://uploads.strikinglycdn.com/files/c57ea677-c024-4fd6-91fb-9a40aa2352d0/4599548939.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_off00010500.bin
662c596b610aef362c7ce491cc89fddd1d2b5f75e78cc1b06a35e9fca2a852dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 5088 bytes
font_01_sfnt_off0001165d.bin
ba1bacb73cdbf210e588b9b4e6ebb2425f28bd6967ae66faa515ddfb3177011b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 12328 bytes

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