Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ff7c8b66409720…

MALICIOUS

PDF

77.3 KB Created: 2021-03-22 13:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03b8fcef005650a4e5e3f5ed73ebc042 SHA-1: dadbf63a907b5b5a39e3e60d13aafd29cf98a808 SHA-256: 33ff7c8b664097201a7cb9da9591d73448e7824898ca804ab7dbd4eaeba7b335
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=does+the+romeo+and+juliet+law+exist+in+california
    • http://buybritishcat.com/good_persuasive_essay_topics_for_high_schoolgm9px.pdf
    • http://fortuneo-enligne.com/stickman_shadow_jailbreak_prison_escape_game_3d_download2v253.pdf
    • http://lodomujimujug.mywebcommunity.org/zoxagojiwamogasera.pdf
    • http://nadukod.22web.org/renewable_energy_books_free_download.pdf
    • http://koparikamoze.scienceontheweb.net/53347069782.pdf
    • http://wuvudazesog.22web.org/47830498008.pdf
    • http://dimozakebaba.scienceontheweb.net/how_to_delete_facebook_account_2020_ios.pdf
    • http://baliferifopiz.mypressonline.com/9654932685.pdf
    • http://runmasten.online/7757510570hrt08.pdf
    • http://megatorg.ru/epson_printer_not_printing_black_ink_properly6y30a.pdf
    • http://ig-copyrighthelpcenter.com/dobofuxebuloneketkrxtr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3abd962c-01ab-4be5-ba98-6abffd21a0a6/55847364208.pdf
    • http://zapofekeba.rf.gd/acer_aspire_one_charger_19v_2.15a.pdf
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_d725537c9b904dacab1bcdc633b66ef8.pdf?index=true
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_4bd0691d9117474fbe0f9ec6c4bcba95.pdf?index=true
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_0c6445940dc0497cae9583c1255b86c2.pdf?index=true
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_8fe01272ddba4cbb8905a1e4dfe57c50.pdf?index=true
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_0eaffa7d166a48b99ae07773c787f925.pdf?index=true
    • https://uploads.strikinglycdn.com/files/484277ab-c144-4589-93e3-ce7fb4325d81/iphone_6_plus_how_to_use_apple_pay.pdf
    • https://uploads.strikinglycdn.com/files/201fc7ea-eea7-424d-b4f7-599e2b2cda47/domiwuvumifenor.pdf
    • http://xozisugogeg.epizy.com/convert_to_dwg_autocad_2020_online.pdf
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_885bcb6d40b6417cbd67685819ff60e7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6376b934-1b03-4aef-8ed2-75fdc03e182d/helter_skelter_movie_1976_full_movie.pdf
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_ae90b9e5f7584de8bd835aa51f3cf7d8.pdf?index=true
    • 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_off0000eeea.bin
cc2053b560a6eb48562d286110e8e1475eb1b5f7dd04e3f5ab1fe908b09ef8b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 5496 bytes
font_01_sfnt_off00010189.bin
e97f0982d6258450bd16efdb002df1a4f0846d79288ede2cd168acfceeb33019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 10484 bytes

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