Malicious PDF — malware analysis report

Static analysis result for SHA-256 988c1d2b54f18769…

MALICIOUS

PDF

94.6 KB Created: 2021-05-06 17:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6437ee1d1767adb89a757ef7c62a4b49 SHA-1: 5538a9f95f1c73f1d6c81be0642ae6b3408c28ae SHA-256: 988c1d2b54f18769a507b3f2ddd57162f83d38ba91a7450e07789560f0e09147
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://fokemale.ru/strik?utm_term=joseph+prince+sermon+notes+on+tithing PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414860/normal_5ffff5d868c03.pdfIn PDF document text
    • http://felagem.getenjoyment.net/export_html_to_nodejs.pdfIn PDF document text
    • http://lorezagosuvese.scienceontheweb.net/ametropia_definicion.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/holistic_nursing_approach.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_60246ce612a90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451955/normal_5fe69b05a7121.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/70287271692.pdfIn PDF document text
    • http://buvalopexur.mygamesonline.org/birmingham_barons_schedule.pdfIn PDF document text
    • https://faperusa.weebly.com/uploads/1/3/1/4/131454178/mupokibekaliru.pdfIn PDF document text
    • http://xagugudel.sportsontheweb.net/calendario_mundial_rusia_2020_horario_chile.pdfIn PDF document text
    • https://weritudasokapo.weebly.com/uploads/1/3/4/4/134494226/zivebumuvofit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502439/normal_602c8e486bec1.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/motor_learning_and_development.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459481/normal_5feb01cccb4af.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/international_business_concept_environment_and_strategy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sopexalibip.onlinewebshop.net/binary_octal_hexadecimal_number_system.pdfIn PDF document text
    • http://posikin.myartsonline.com/better_than_before_meaning_in_tamil.pdfIn PDF document text
    • http://xirofapinowud.atwebpages.com/pelem.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/33677420629.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/consumer_reports_best_rated_car_seats.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/how_many_miles_will_a_2008_bmw_328i_last.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_off0001356c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356C 5092 bytes
SHA-256: b31ca2c4db07ab49332ac524f164202ab4552e21d31dcb061a767de7363fb7d5
font_01_sfnt_off00014698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14698 11440 bytes
SHA-256: d1b48840874e1aca6790e21b424d1fb34e8974c75421ac95ca332c766a2c5280

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