Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0bbace3fbc9b63b…

MALICIOUS

PDF

76.1 KB Created: 2021-05-08 07:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e696b9671d6aba182fc4a8aa7b9687ed SHA-1: 5e1fae61dfaf9c9002a902e8775023b70682627b SHA-256: e0bbace3fbc9b63ba2cb71eae8195ada3376cad5931bfbbe608b96a6196cb7e0
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, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://zajinet.ru/strik. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest potential for embedded malicious JavaScript, commonly used in PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://zajinet.ru/strik?utm_term=the+rate+of+return+on+total+assets+measures+a%25E2%2580%258B+company%2527s PDF link annotation
    • https://cdn.sqhk.co/lizuloka/ja5jgji/73863261113.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/3VyWbrD/board_games_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/bgcbgj7/90143416867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_600755b8664fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_5fd83b3aad30f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482009/normal_603e4a553d0be.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/aijifja/sun_tzu_history_channel.pdfIn PDF document text
    • https://cdn.sqhk.co/xexerekija/UijWLji/24503967586.pdfIn PDF document text
    • https://cdn.sqhk.co/lujipalaf/ihijcRw/biruvaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/gesuxafom/Q4he7hg/mimpi_gigi_bawah_copot_semua_pertanda_apa.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/4TgeGgh/38201136981.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/wloWejf/45669105275.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/8834aba2-6a79-4dc2-9020-a44b01ea60e4/how_to_draw_anime_hair_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31b9219-ea01-439a-8467-846da0c6843a/what_is_the_base_of_class_b_airspace_at_lakeview_30f_airport.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b0a5fe-54fb-40be-8044-47623541edeb/par_quoi_remplacer_le_beurre_de_cacao_en_cosmtique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6c8b49-2b10-4d51-bde0-bee5e0d2dc82/permission_to_read_dr_seuss_books_online.pdfIn PDF document text
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_c06773ba216048cfa67179755e13590a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fe7efd-9bb0-48a7-9e35-da9208c85c88/conceptual_physics_textbook_scavenger_hunt_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5044d465-af96-4b16-abb2-fbbcc815a305/vutolumimarexamem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835b1010-6546-4b57-af78-013987a7d695/27610863922.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_efa48cc7fcb74933a668a0c678ee0a0a.pdf?index=trueIn 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_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 5348 bytes
SHA-256: 76944c2b5b9a7af15a3628382b2b452d6fa03982bff32861681f57da84a1ed53
font_01_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 10476 bytes
SHA-256: 10608695825c2325817b6f093722fa03a35c3178ee82ac018317a0fe7752c373

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