Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b486f9b34ab7a55…

MALICIOUS

PDF

77.6 KB Created: 2021-04-07 00:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 75d18c725c76e2342ce69be63893c48a SHA-1: 6b8995cd770b784222d46129c04f12344559e36d SHA-256: 0b486f9b34ab7a55304f571e64ce90a57ae9d5d1c9bd9a947fe2f6cf7fc3ab75
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary malicious URL identified is https://seumenha.ru/award?keyword=algebra+booleana+teoremas+y+postulados+pdf, which is likely used to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/award?keyword=algebra+booleana+teoremas+y+postulados+pdf PDF link annotation
    • http://gejurabek.getenjoyment.net/56467982169.pdfIn PDF document text
    • https://cdn.sqhk.co/kupibetefuko/hjJgGgf/minecraft_skyblock_mod_xbox_one.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofigeniso/icmhhia/pixel_soldiers_the_great_war_apk.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/panasonic_phone_system_user_manual.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/6ba9c3da-59b3-4063-acca-6c93a97abb53/what_names_are_not_allowed_in_islam.pdfIn PDF document text
    • http://rovizomaguwex.atwebpages.com/3555465223.pdfIn PDF document text
    • http://zedofaxuboz.onlinewebshop.net/how_do_you_say_the_power_of_christ_compels_you_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/vedarefaxigijiwu.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_bad9cc05c0234a6f8a1cbb17a4dd9056.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salade/91491044673.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_7ef197a29ac04ff79adb7bbcafbbc116.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_a88e89d603f64dfb8049fd825c4a4694.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/620d84c5-abb0-4846-befb-713f7efc08b6/defensive_driver_post_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/37540314109.pdfIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_4160ee8d2fba448982f4a0ee72bbef99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ce65ac-c94b-45fb-a530-3522cc0b07fb/learn_spanish_grammar_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/233c4374-9c73-4d29-a629-553f3b464564/trilogy_ventilator_operators_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/annuity_factor_table.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_1f51102394b44a838dd908281fd2db3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dozuga/39903394218.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/sample_treasure_hunt_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/776b6fa8-334e-40c6-a710-b4054ce6d7cd/zikapozulobora.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/reporter_journalist_salary.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_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 5592 bytes
SHA-256: 20ffb35f1df4d52cb6194e4517116d342f83d69de9b3a25a87ffa38704a5239e
font_01_sfnt_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 12148 bytes
SHA-256: 9edbceb75bc2cf48f34858acaa23ed075414447a939cdade9d64fd92ea1a13e0

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