Malicious PDF — malware analysis report

Static analysis result for SHA-256 b148bc4ee8a45d40…

MALICIOUS

PDF

78.9 KB Created: 2021-03-21 21:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ce9598a050f887eee2b8b844c3dea086 SHA-1: 5b95b36a58b4246e3c338471273ffe9c12036dde SHA-256: b148bc4ee8a45d40b14d2c98ea1acd65ae478d7d5d983a207889b55c5ec8b82f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crophysi.ru/award?keyword=memento+mori+short+story+pdf PDF link annotation
    • http://bekokasutam.22web.org/sawuzig.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/zjjhbge/ramidamupuzegavexarepamug.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/gcnaAZB/custom_keyboard_color_changer_laptop.pdfIn PDF document text
    • http://gukukoraxolu.iblogger.org/android_pie_root_exploit.pdfIn PDF document text
    • https://cdn.sqhk.co/duwewofowus/dhevgde/friend_finder_networks_data_breach.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/Jii12MH/94983579059.pdfIn PDF document text
    • https://cdn.sqhk.co/xoradofexul/eMgetAb/suppress_definition_law.pdfIn PDF document text
    • http://vojamugoju.22web.org/baminafolibewirekeniru.pdfIn PDF document text
    • http://nelakuk.iblogger.org/dofuseripo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fogibi/76416196750.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/three_phases_of_matter_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/prevent_form_submit_twice_javascript.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/66562572816.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/wekox.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/8269225428.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_079b471a9d85402e922b65673c3796a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vojapu/modelo_de_memorandum_de_llamada_de_atencion_por_inasistencia_colombia.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/givumoxirafutiwanon.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/92915235151.pdfIn PDF document text
    • https://25cf7bc6-226b-4013-96fa-c64d334b7dac.filesusr.com/ugd/317e1a_699e80b2aae64ac8898483da165ed896.pdf?index=trueIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_b29b313346864a32b22dea39a01769a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rumezo/zafojipezuzefojelolerox.pdfIn PDF document text
    • http://fosuxono.epizy.com/13864489129.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/97381276535.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/what_order_do_the_hobbit_movies_go_in.pdfIn PDF document text
    • https://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_5f9f7221a4014a70bbced377a7befc4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zowibatev/53271173732.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_58bbf67b2c22425283d84613e080cd1f.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_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 5148 bytes
SHA-256: eb12b1f18d51d3fff42c6e1bfdf0d6e0fdd960f91d47734d53b49b0379e0a36b
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 10144 bytes
SHA-256: 16707fa6feccb480c207f0ced527e7654bb509fb3bb8b271449673983d525e34

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