Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43c41342f33b129…

MALICIOUS

PDF

75.1 KB Created: 2021-03-15 16:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 41ce3262b93bfa52fddfe8f4ede09935 SHA-1: 9f954b27354409d6cc2014fecc98e0705401a251 SHA-256: a43c41342f33b129be55ff420fbb706b3c9159268c4110ea098950adb73b7aa0
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL, 'https://jumiwimov.ru/strik?utm_term=why+isn%2527t+my+subwoofer+working', likely serving as a lure to a phishing or malware distribution site. The document's structure and the presence of many distinct hosts suggest it functions as a link farm designed to obscure the ultimate malicious destination.

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://jumiwimov.ru/strik?utm_term=why+isn%2527t+my+subwoofer+working PDF link annotation
    • http://fukanaduvubife.22web.org/approaches_to_learning_pyp.pdfIn PDF document text
    • http://heartcenteredequestrian.com/dialogue_at_the_airportwot19.pdfIn PDF document text
    • http://zamowafa.mywebcommunity.org/how_to_use_cooks_essentials_pressure_cooker_as_a_slow_cooker.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/what_is_difference_between_letter_of_credit_and_bank_guarantee.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/medical_report_translation_to_arabich81kc.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/architecting_microsoft_azure_solutions_study_lab_guide.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/79398459395.pdfIn PDF document text
    • http://rodisawikikofu.medianewsonline.com/what_is_the_remote_code_for_toshiba_tv.pdfIn PDF document text
    • http://topcreditmonitoring.info/nitogekinjbbz.pdfIn PDF document text
    • http://reduslim-shop.site/hallelujah_to_the_lamb_choir_sheet_musicfa2te.pdfIn PDF document text
    • http://mejarada.iblogger.org/84220128704.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/breeches_pattern.pdfIn PDF document text
    • http://filmera.ru/what_is_the_latest_version_of_the_kindle_paperwhitepzuf8.pdfIn PDF document text
    • http://mezoterilijixa.22web.org/google_chrome_remote_desktop_android_application.pdfIn PDF document text
    • http://converstarget.ru/willie_nelson_songs_youtubei7uto.pdfIn PDF document text
    • http://axecheat9.xyz/resize_mac_previewyi3gv.pdfIn PDF document text
    • http://ludesajezopaju.medianewsonline.com/derivative_of_inverse_trigonometric_functions_proof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofaxafogi.myartsonline.com/94606459754.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/simifikusokavod.pdfIn PDF document text
    • http://todugiremo.epizy.com/contact_list_template_google_docs.pdfIn PDF document text
    • http://dokedajonanumi.rf.gd/video_background_easyworship.pdfIn PDF document text
    • http://bamasagure.epizy.com/android_software_for_pc.pdfIn PDF document text
    • http://jopubulebava.rf.gd/60855143042.pdfIn PDF document text
    • http://xupiwepe.epizy.com/toponaw.pdfIn PDF document text
    • http://lavapokapajemob.myartsonline.com/mifibubowo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 5384 bytes
SHA-256: 42376f1e4aacd1f807c5d07252ee600fec2135bb7c2e0e62c2fb7c780f582a94
font_01_sfnt_off0000fc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 10200 bytes
SHA-256: 68d163c81f26d5c188bc219bef083992ccdd7c5ed9f711f2e264c64a0691e856

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