Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc286ed69c11af7…

MALICIOUS

PDF

75.2 KB Created: 2021-03-16 21:49:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 92c91b8a3369b8b4c9fa2ca013711cb5 SHA-1: 1066440704c8743175b2f5534494e946d2e020a5 SHA-256: 7fc286ed69c11af70bb342b93e8cd4684f27dc5a5dc1f314fd1481cee5e5e710
134 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. It uses an invoice-themed lure. 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 0.9991

Heuristics 6

  • 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nipisod.ru/123?utm_term=caesarean+section+guidelines+pdf PDF link annotation
    • http://tozaworewinox.mywebcommunity.org/babypips_candlestick_cheat_sheet.pdfIn PDF document text
    • http://morasufas.iblogger.org/86230678093.pdfIn PDF document text
    • http://tafelutij.22web.org/adobe_acrobat_reader_6._0_version_free.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/why_did_graystripe_leave_thunderclan.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/someone_snitched_on_me_lyrics.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/25670024340.pdfIn PDF document text
    • http://dazakaguwaxe.22web.org/spectra_s1_plus_boiler_parts.pdfIn PDF document text
    • http://womuvizitina.mywebcommunity.org/definition_of_sustainable_development_goals.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/how_to_heat_my_coleman_hot_tub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe408929-39cc-4f60-8e08-c56dd14337c8/97002050950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/006d7c07-4c0c-4c85-95f0-3b37c08bea9b/8824166615.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/4271211000.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/jewotobokumesurezupis.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/rigilebuvinu.pdfIn PDF document text
    • http://tarepos.onlinewebshop.net/74602282503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c164cd74-be30-480d-bb19-34349421e2f4/duxarakegar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f760c1ca-840f-4de1-99bb-01bc579c0933/how_to_draw_a_turkey_stack_folding_surprise.pdfIn PDF document text
    • http://bopevevene.epizy.com/29353945393.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/xut_file_b_li_font.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1ef692-7b98-4524-a97c-8691415bd2cd/95394671821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e411604b-4a1a-4158-a8ce-9cf22d06faca/sonic_large_fries_nutrition_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c63f1e32-ac1c-4919-b4df-a05c551a2ba1/silexikubawikodegixu.pdfIn PDF document text
    • http://nuxagev.epizy.com/54775571549.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/payment_receipt_template_word_doc.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_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 5228 bytes
SHA-256: bb0dcf6d670d81b5db7df87b10b9424d30398348d7d617c4d3e13d60009ac3ef
font_01_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 11112 bytes
SHA-256: 3282b4ce7c1c33deb148717d41524c34e09bdfe8b6c93c7104503390c4dffa2a