Malicious PDF — malware analysis report

Static analysis result for SHA-256 2337f66e694ae2d6…

MALICIOUS

PDF

79.5 KB Created: 2021-04-06 15:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1330d830ec2f0dd97901cfe385322c35 SHA-1: e775c9d5122a768fbcc933eb0c0d9b1bdbb86fef SHA-256: 2337f66e694ae2d6859b9608e5a5428fd4a7c50de182a08799737805cc02dfab
156 Risk Score

Malware Insights

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

The file is a PDF that was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary external URL points to a domain that appears to be used for distributing malicious content. While no scripts were explicitly extracted, the nature of the link farm and the phishing detection suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=catalogo+boticario+dia+das+maes+2020+pdf
    • https://cdn.sqhk.co/dobajinorite/YaidAjO/mepelozaliforarizaja.pdf
    • https://cdn.sqhk.co/sunaxidida/oJdgjhe/13550857226.pdf
    • https://cdn.sqhk.co/xizojotozodi/ihbXQCc/resection_of_cavernous_malformation.pdf
    • http://viwowiziboso.22web.org/39599307606.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/navoburarovada/59358442348.pdf
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_95db7424599e473fb2703a7673b55af9.pdf?index=true
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_a1467eea52d24882b1597b443a5c3794.pdf?index=true
    • https://uploads.strikinglycdn.com/files/442ab98d-939d-4449-9ad7-23c936c318d5/visual_basic_excel_2016.pdf
    • https://s3.amazonaws.com/werowibovezoje/oecd_transfer_pricing_guidelines_free.pdf
    • https://s3.amazonaws.com/jaloto/62484425362.pdf
    • https://14579757-8399-40ae-9aa0-1c510f02119b.filesusr.com/ugd/5613ee_eea650ec557345a9a67a14e28f4c15c5.pdf?index=true
    • https://s3.amazonaws.com/sevoga/transformer_bumblebee_voice.pdf
    • https://s3.amazonaws.com/nazekisigiduz/how_to_apply_for_planet_fitness.pdf
    • https://uploads.strikinglycdn.com/files/e561f589-d33a-45a7-8312-5b0b5e8edba1/20395402924.pdf
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_f4ac7391857847c4bff950dac0435060.pdf?index=true
    • http://jarifixe.epizy.com/electronically_stored_information_order.pdf
    • https://uploads.strikinglycdn.com/files/e9bd1a87-0fb3-4fa3-be70-b7a5f3b16092/the_power_of_less_review.pdf
    • https://uploads.strikinglycdn.com/files/46d26355-1f60-4d71-97c3-9e8900c9bde8/24390141956.pdf
    • https://uploads.strikinglycdn.com/files/c6053aac-b15e-463a-9f5a-ec3b91f6bd58/7.3_transmission_fluid_change.pdf
    • https://uploads.strikinglycdn.com/files/006aeb77-4993-4596-b4e9-1944ffe32ff9/volkswagen_service_department_hours.pdf
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_851b70f6ed6348448bbaf9f1d6365767.pdf?index=true
    • https://uploads.strikinglycdn.com/files/454d9701-ac15-401a-892c-c594c0cab36f/sample_journal_entries_for_high_school_students.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36f.bin
1aa7af7483ca8713a6f06a9386b81d71fe98042032a0f18d7898f74aa597bccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 5796 bytes
font_01_sfnt_off00010705.bin
49a109f42b26672551caf9e1ea30f02178637fc7eb37271122de02e0115f2999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 13196 bytes

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