Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac4d669d1460aee…

MALICIOUS

PDF

83.1 KB Created: 2021-04-04 03:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9743740579fe95f81eb7823375a94f4a SHA-1: 0379fef14a84b3419fac13d8a7e30de8d93b23b3 SHA-256: 4ac4d669d1460aee04b9a4346ddc766f91d0893e052863911e47d2334d730de1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO link farms or phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/award?keyword=advantages+of+nuclear+family+pdf PDF link annotation
    • https://cdn.sqhk.co/wosipuvetot/AZjcMRZ/joplin_mo_mall_stores.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471948/normal_6040dc4e7cdff.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/dGhg5ii/super_bubble_gum_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426073/normal_60522f42d2a97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_600a1efce7bc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_6039a019a2a61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481064/normal_6034590ba63dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_2e25c60bbf7242dfb92b2b1339342441.pdf?index=trueIn PDF document text
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_7e5491d19dab42eab78f56f09fa7e8f5.pdf?index=trueIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_89681974d85b4294a141df947382a935.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_ff2578813056451787f76f6fc9e78635.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/que_es_un_ensayo_escrito_en_prosa.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/vocabulary_builder_activity_the_constitution_combined_vocabulary_reinforcement_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/nogugejezovumabibula.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/bokulowunuvozibibe.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_a3983980cfb9426994dfd13713af40cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jijari/champagne_limousines_regular_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/vaaste_song_mp4_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/restriction_enzyme_worksheet.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_a357b10d6da9400f9e2cb0ddc50df73d.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_9f24ff7a1ca44a1a9a71e30f08c07b8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widuxade/xbox_360_controller_wired_gamestop.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_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 5628 bytes
SHA-256: 366f06d29e0326493c9d0468654b684a5d99249ba952a4cab40624405afb0043
font_01_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 10908 bytes
SHA-256: 8f6ace0a4d626a0e491e03c4bdc61576051685d37ef2bf9e92ea09ba2e3dd8eb

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