Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b40670d4eca2d6f…

MALICIOUS

PDF

141.5 KB Created: 2021-03-18 21:12:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1e8888dcd5834e30f0dd2293c846cead SHA-1: d2fde2ccf4de99483cbca8eceffd1d5c8fa9e98f SHA-256: 0b40670d4eca2d6f55054c9363e23fe1406f9c1fda642c53937ebb0f522349a3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a high ML classifier score indicating malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it may be a generated document used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=what+is+1280+x+1024+resolution PDF link annotation
    • http://zugapuvu.mywebcommunity.org/wedding_budget_worksheet.pdfIn PDF document text
    • https://wunobenera.weebly.com/uploads/1/3/4/8/134887230/fotigelajiresetolo.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/royal_sovereign_portable_air_conditioner_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_5fd92676a6ecd.pdfIn PDF document text
    • http://lastmarkt.ru/jacoco_report_exclude_package_gradley1wgy.pdfIn PDF document text
    • http://stickerrus.ru/36159677660jt053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_602eb45faab52.pdfIn PDF document text
    • https://namekabesomi.weebly.com/uploads/1/3/4/6/134668803/6125933d.pdfIn PDF document text
    • http://pubgucbayim.com/banner_template_png_filenk8tj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_604afc6fda5f4.pdfIn PDF document text
    • http://douchehub.xyz/aquatic_animals_listfeemb.pdfIn PDF document text
    • http://tamogulaganero.scienceontheweb.net/ps_vita_x_2019_release_date.pdfIn PDF document text
    • https://vekeliludodim.weebly.com/uploads/1/3/4/7/134745250/b781d.pdfIn PDF document text
    • http://trylait.club/clockwork_angel_series_first_book83kdu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kimoviranonaf.onlinewebshop.net/bsc_2nd_year_maths_book_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/lithic_arenite_formation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f763b00-92c7-4069-b743-241a98944560/77117772631.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/trolls_invitations_templates_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60837ed2-e456-4149-b551-cbb0c900c2f8/gojenezofinozuvarufejake.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/autism_spectrum_quotient_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4d8a41-b845-42a3-9b3e-6f609faf5797/87578844348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a7baec2-6a41-4efe-8d69-67a13ad513b8/93428846957.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/64967439685.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6E5 5344 bytes
SHA-256: 0714e3f830a29570db1450f9878a8b277a5624596d666818feb03b3599193645
font_01_sfnt_off0001d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D913 12676 bytes
SHA-256: 4343fecf9c473b9bd9c06ac6b9c46053e27a5ae3abe3c08588a447285409d148
font_02_sfnt_off00020447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20447 16072 bytes
SHA-256: f0406f8caea753d6e85877bb79d5bffc070628cb70b4ca7a47dccb6851f2375c
font_03_sfnt_off000218d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x218D6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34