Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ef4cbbf2e02d97…

MALICIOUS

PDF

75.4 KB Created: 2021-03-16 19:04:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87d195775ee9df097dfb4ec7300a58af SHA-1: 98f355c8c1a12b1d84f41d3a94a6b59df8c997e9 SHA-256: a2ef4cbbf2e02d97ed8598d0938f22caa705b9ec7cee83d6921c1f733893a1cd
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many URLs pointing to PDF files, suggesting a SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=amazon+echo+dot+user+manual
    • https://cdn.sqhk.co/vuwonesi/cgjij9S/snapper_fish_and_chicken.pdf
    • https://cdn.sqhk.co/wazotifuk/POohhhc/real_gangster_crime_simulator_mod_apk_unlimited_money.pdf
    • https://static.s123-cdn-static.com/uploads/4461497/normal_5ff4eb43e8f4c.pdf
    • https://cdn.sqhk.co/kutajanode/jjbMgcI/15984900159.pdf
    • https://cdn.sqhk.co/jinuzekovodi/hYrWn2L/4_in_a_row_cool_math_games_unblocked.pdf
    • https://static.s123-cdn-static.com/uploads/4368772/normal_5ff7ab42bf4db.pdf
    • https://cdn.sqhk.co/baresupujar/zhaM0mL/niti_aayog_sustainable_development_goals_agenda_2030.pdf
    • https://cdn-cms.f-static.net/uploads/4454821/normal_5fd2797884fce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://limufewugewo.rf.gd/tribe_sebastian_junger_summary.pdf
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_a18f81ce6ab74a098282ae3950dec6f3.pdf?index=true
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_c868b064f62e4b639f0d8b6ec33c45d0.pdf?index=true
    • http://duvipegi.epizy.com/minecraft_windows_10_edition_cracked_free.pdf
    • http://pigozezidum.rf.gd/laviwam.pdf
    • https://s3.amazonaws.com/nonabafat/boss_hogg_outlawz_serve_and_collect.pdf
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_7954b0c49f5c4482933e329ef50d334d.pdf?index=true
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_fbcfdcef7c594f45881fe1b6c2d3b480.pdf?index=true
    • https://s3.amazonaws.com/nezanurugega/46726512284.pdf
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_8c7e8ba614fe42e2bea63ad45e02f607.pdf?index=true
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_becf2311c1ef429887d74a862f067d69.pdf?index=true
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_e8a2e14045d243cf9ba083567de1549a.pdf?index=true
    • 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_off0000e925.bin
3f69addeab2f624fd7d511e91021baf7bc7691eb92f1b9c5d70b6c4b6162ef8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 5216 bytes
font_01_sfnt_off0000fab7.bin
e4c5bfed861b1549da7bc0b400bfe76bfd80a61d9271e84ddc6a26414cae87ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 10568 bytes

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