Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6db523aee284c7…

MALICIOUS

PDF

80.1 KB Created: 2021-03-09 23:17:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e20779c41114247a102b7d996ad85220 SHA-1: fa172f2e064bac13cb8e4a2c68d63310cc720550 SHA-256: 8a6db523aee284c789f1e021ebac7250355e76b26e94b18ed38e30f5e100c599
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=oster+steamer+user+manual PDF link annotation
    • http://tenipimutav.mywebcommunity.org/99449731012.pdfIn PDF document text
    • http://vquest.website/224212072881zj6b.pdfIn PDF document text
    • http://juraxoxodas.scienceontheweb.net/opti_exercise_bike_seat_replacement.pdfIn PDF document text
    • http://workshop-fb.ru/46493412755ewv92.pdfIn PDF document text
    • http://jerijoba.iblogger.org/briggs_and_stratton_675exi_oil_type.pdfIn PDF document text
    • http://puduvab.sportsontheweb.net/vunareke.pdfIn PDF document text
    • http://gogosesetuver.22web.org/libro_la_amortajada_gratis.pdfIn PDF document text
    • http://xapiduxirob.mywebcommunity.org/xolujosuwiposexid.pdfIn PDF document text
    • http://lipenav.mypressonline.com/carbide_insert_chart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fikuvine/45932701199.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/dnd_5e_holy_avenger.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/cyberpower_1500_avr_battery_backup.pdfIn PDF document text
    • http://juruzimezez.rf.gd/brasero_kali_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/vizud.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/ketovorevikurel.pdfIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_25a92e288a5b4c49b663559aeed17b6a.pdf?index=trueIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_2b578e7c243e4c8da6648fe817278a2b.pdf?index=trueIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_5b42b02ed4f84a8380425b0addca08ae.pdf?index=trueIn PDF document text
    • http://jisijuvod.myartsonline.com/painting_with_a_twist_dallas_tx_75209.pdfIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_c7b6b757c685415298a10e6c91a6aa65.pdf?index=trueIn PDF document text
    • http://volajigatume.epizy.com/sociologie_de_l_ducation_patrick_rayou.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0000fdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCE 4856 bytes
SHA-256: a8ea0c7019dbe9fe7a3164fcc392709e77f646480743901ba5c9ff90be7af79e
font_02_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 10752 bytes
SHA-256: 0cd8b09a36a83a3386fca9fa6e3b0a97a8270f107fd91db227b98e802c2a86c1

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