Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f71d7461864b2f2…

MALICIOUS

PDF

77.4 KB Created: 2021-04-19 18:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41d008f1c9de14f6c1684c2eaf2b45c8 SHA-1: 80a18d418dd83699c2b3233359b4931efec87a0e SHA-256: 2f71d7461864b2f2a78069ec1e6aef9d538e6d43aa3fba41835eec4e373005d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains a question about enthalpy change, which is likely a lure to direct the user to one of the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=is+enthalpy+change+of+hydration+always+negative
    • http://balonixom.22web.org/testing_effort_estimation_template_excel.pdf
    • http://wupoluse.22web.org/epigenetics_textbook.pdf
    • http://jigitozunawada.66ghz.com/what_questions_to_ask_in_a_project_manager_interview.pdf
    • http://nebefajibavake.22web.org/65383281087.pdf
    • http://giwitap.getenjoyment.net/51375184890.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://diguluzid.epizy.com/introduction_to_automata_theory_hopcroft.pdf
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_b1a316642ef246e7813be51e8d6b5633.pdf?index=true
    • http://doroxokile.epizy.com/73363095867.pdf
    • https://uploads.strikinglycdn.com/files/3e58408a-9f1e-489e-9621-01caf4f64de6/5632968386.pdf
    • https://uploads.strikinglycdn.com/files/8453f8d2-37dd-4a61-9ef7-c2818b9838ca/who_used_guerrilla_warfare_in_the_american_revolution.pdf
    • http://zadabodemuliju.epizy.com/superlative_adjectives_examples.pdf
    • https://uploads.strikinglycdn.com/files/e16f3634-0f03-4cbc-addb-baa85736d2d2/gobisawalogar.pdf
    • https://uploads.strikinglycdn.com/files/96f78fda-2d3d-46d0-a52e-bcc5ad58e6a9/razifiser.pdf
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_fc00c149fe054ff48db328324d66d150.pdf?index=true
    • http://vomitad.epizy.com/ledodosalota.pdf
    • http://dakatowase.epizy.com/lidilebuvu.pdf
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_d134141979ea454bb23023e5e45b4a18.pdf?index=true
    • http://mizujem.epizy.com/ejercicios_de_pronombres_relativos_en_ingles.pdf
    • https://uploads.strikinglycdn.com/files/9176ddd4-8a44-41cd-a912-89fd83e8eeca/minister_of_indigenous_services_bc.pdf
    • http://ladurabazidema.onlinewebshop.net/factors_affecting_acidity_and_basicity.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02d.bin
06611334310cc43798d1150f47c419155224f7d72bdf3cea1b34cb6cfae59cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 5608 bytes
font_01_sfnt_off0001035d.bin
511547f8e7c2de2f4cb37a188f3f80a00ecab5299256263ef201415979323c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 10672 bytes

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