Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c7e05be864c48f…

MALICIOUS

PDF

82.1 KB Created: 2021-04-28 23:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d5ff725b2aec9e29945fc09555aa87ae SHA-1: 4839824a04d62d733ccbfb8787d10af6d3496b1c SHA-256: 10c7e05be864c48f8ddd9904b40d7147bc8578950dda364ead3c2bd2b0da07b8
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to a suspicious domain (vilenefex.ru) that is likely used for phishing or to host a secondary payload. The presence of a link farm suggests an attempt to obscure the true malicious destination or to distribute various lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://vilenefex.ru/strik?utm_term=rowenta+steam+care+one+smart+temperature+iron PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477408/normal_5fc5d630629b8.pdfIn PDF document text
    • http://bukobaxaz.getenjoyment.net/51690551010.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/wexusewipibamaxiv.pdfIn PDF document text
    • http://jotafitosixa.getenjoyment.net/ielts_writing_task_2_academic_vocabulary.pdfIn PDF document text
    • http://hotsales-com.xyz/fepobibibakubununot2ten.pdfIn PDF document text
    • http://instapriz24.online/15449514951wkk6d.pdfIn PDF document text
    • http://cookwellbakewell.com/20441144237efw31.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/the_new_inductive_study_bible_esv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420430/normal_5fd19bbf0b731.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/1d344534-92dc-45a6-9ac4-6f1680706b4f/writing_tools_50_essential_strategies_for_every_writer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d086d9d-b637-43f0-862a-da61f1763469/common_mistakes_in_spoken_english_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68dfe339-c5af-436e-89c6-cc1bed043571/2015_jeep_grand_cherokee_parts_manual.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/plano_arcos_de_la_frontera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74b119d-4df2-4a5d-a1d4-bbc4d0fcd0ee/how_do_i_reset_my_cuisinart_convection_bread_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d59c6b37-408e-4e5a-8ca5-d5690ff86bb9/list_of_iatf_certified_companies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/814f0d08-0479-4daf-8052-1f809ff69902/lasko_ceramic_tower_space_heater_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42696b6e-fd23-4eae-9117-c59939119a6a/what_are_the_three_main_types_of_business_activity.pdfIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_1d51bfd280364cb292afac57350e1df7.pdf?index=trueIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_9078385d198d4d80a46d9426bcf86a0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df1550dd-4500-406b-920b-388f384e71d0/jepifuvokamamujuket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217b020a-ebcc-4729-bc53-c9fd47897db7/mecanica_vectorial_para_ingenieros_dinamica_11_edicion_gratis.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_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 5144 bytes
SHA-256: f998f0bb04d2c82e101a636e20ee818ba3e495d194e00d41b0a75956515f8958
font_01_sfnt_off00011588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 10964 bytes
SHA-256: 55bd605cdc75dced18b9dae1294ce528209aac4eef1d5bc14c49bec3d35843c3