Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f0c1ffb384c3e8…

MALICIOUS

PDF

76.4 KB Created: 2021-03-31 17:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 41d39f8b26003fb208b5124f3311075c SHA-1: 1f4917b6a04c3ad77864b3e16f7b11bd6a4e9494 SHA-256: 57f0c1ffb384c3e8dab5d16ce0e4867a46599768add82745f9e4652e6c24810e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware download site. The document body, though heavily obfuscated, appears to contain keywords related to the embedded URL, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://xajibur.ru/wix?keyword=minecraft+apk+pc+android PDF link annotation
    • https://cdn.sqhk.co/fusaduxuw/1jd3jf0/57710528275.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/definition_of_education_by_different_philosophers.pdfIn PDF document text
    • https://cdn.sqhk.co/matejedu/fXhb26P/ipcc_report_2007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_60401e82f31b6.pdfIn PDF document text
    • https://cdn.sqhk.co/kixikeli/PSZzjcC/apple_music_file_location.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475737/normal_5ff158f38a518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408711/normal_5fd664fe109f8.pdfIn PDF document text
    • http://zeruxejobimal.mywebcommunity.org/autocad_3d_commands_shortcut_keys.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a73ea5a-cea6-4bac-ad9e-065b8deb658a/listado_de_verbos_en_ingles_en_presente_simple.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/how_to_reset_a_furnace.pdfIn PDF document text
    • http://refusunono.onlinewebshop.net/geguzuxuwal.pdfIn PDF document text
    • https://16cc4848-9a85-487f-bc1d-da55f68f8448.filesusr.com/ugd/dcf86b_9caf865c390a41b2a07fc96f102e7c06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c843e83-9600-4b19-a086-d7fc1292e58c/16085550456.pdfIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_74be3fdeaacb46e1a7152c86ff425ca9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosevud/91016690333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2617948f-b4c7-4293-8977-e8bcf1d79bf9/waxivizimobibapisodexifer.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/bonuveduxemavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb6677a-13cf-4c95-bcca-69810d23c5a1/what_are_good_vegetarian_sources_of_protein.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/product_technical_data_sheet_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5970b2b2-3fbf-4ada-bf56-b62b29aa2672/fujitsu_operation_and_timer_light_flashing_10_times.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/76777870793.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/accounting_contribution_format_income_statement.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_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 5008 bytes
SHA-256: da4327c167c576888003bb81d9eab4811703a0a66cbf3aae16f70e640234c4d1
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 10060 bytes
SHA-256: 976e0854a7bf75c787cd59f35ab776559c2d5d38d76b6dc16803244d11e6135b

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