Malicious PDF — malware analysis report

Static analysis result for SHA-256 13eb4c07ba059258…

MALICIOUS

PDF

81.9 KB Created: 2021-03-29 10:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2cdb34a31b4301ba2932a183291e1354 SHA-1: 54a66a263c60602ddf963d33c4256c9001a352cf SHA-256: 13eb4c07ba05925844f779b7bcd76919fa9c458df9e06551856ba52939fde437
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=most+important+topics+in+electrical+engineering PDF link annotation
    • http://giwitap.getenjoyment.net/manual_citizen_eco_drive_e870.pdfIn PDF document text
    • http://sabumow.mygamesonline.org/mugifiduzusi.pdfIn PDF document text
    • http://onlineeshop24.xyz/471307697741lod0.pdfIn PDF document text
    • http://zdsshop.top/how_to_clean_cuisinart_extreme_brewptp50.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/ejemplos_de_minutas_de_juntas_de_trabajo.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/rogugagatuf/monoto.pdfIn PDF document text
    • http://tekusuzuxap.rf.gd/56419540500.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_b2ae5c55ee844b019febff2a0ac89da3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lumixi/paint_cabinets_with_sprayer_or_roller.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/2001_dodge_ram_2500_service_manual.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_e81b6687a0604a8499ed6174fdeab3c2.pdf?index=trueIn PDF document text
    • http://nasukenapab.epizy.com/expanded_form_2nd_grade_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/cisco_dpc3008_modem_specs.pdfIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_cc88f34acb5f49d28c3e4032557d2f7e.pdf?index=trueIn PDF document text
    • http://lekamidoku.epizy.com/kapodo.pdfIn PDF document text
    • http://tefosotolubexob.rf.gd/how_to_set_time_on_alexa_clock.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/multiple_choice_possessive_pronoun.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/tnis_vans_authentic_platform_2._0_checkerboard.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_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 5260 bytes
SHA-256: 8938609d91affe863ffcee30d52e075df7d7bb88775ae63560e80031a35bf095
font_01_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 11636 bytes
SHA-256: b8cf4cbe67c6ae917a6b5610fc5c8a018a4bbd09fa5b48908b6813e7cd489aab

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