Malicious PDF — malware analysis report

Static analysis result for SHA-256 290a06868add437d…

MALICIOUS

PDF

82.8 KB Created: 2021-03-28 18:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 203e12349cc37a9260ea28cd66253bf5 SHA-1: dc11a8471c07e79ec737c1e8fe700800844bc758 SHA-256: 290a06868add437d31a64f68a614b7e83c9ca5e023a2833ed713b01c03dc7bfa
176 Risk Score

Malware Insights

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

This PDF file impersonates a cloud document lure, prompting the user to access a link. The embedded link farm, detected by the PDF_SEO_LINK_FARM heuristic, contains numerous external links, including http://baby-slings.ru/pejobusokowenotediwsxc9u.pdf, which likely serve as a redirection mechanism to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://xezojetit.ru/strik?utm_term=project+management+in+software+engineering+slideshare
    • http://baby-slings.ru/pejobusokowenotediwsxc9u.pdf
    • http://save50it.pro/54695322150b0s8q.pdf
    • https://cdn-cms.f-static.net/uploads/4427820/normal_5fd81a356ff44.pdf
    • https://cdn-cms.f-static.net/uploads/4418972/normal_5fd64a598f5f1.pdf
    • https://cdn-cms.f-static.net/uploads/4385021/normal_60259cbf7e389.pdf
    • http://myyshooop224.site/amd_driver_update_for_smbushfwrj.pdf
    • https://cdn-cms.f-static.net/uploads/4426263/normal_5fe97e6cb2f0d.pdf
    • http://cocobuka3.xyz/80928204887sexn3.pdf
    • http://idealicaitalia-ufficiale.site/46991097493h41tf.pdf
    • https://cdn-cms.f-static.net/uploads/4370088/normal_6022c23226a7c.pdf
    • https://cdn-cms.f-static.net/uploads/4385852/normal_604d83859fd8a.pdf
    • https://cdn-cms.f-static.net/uploads/4447271/normal_602f670ed85ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fb53f9dd-7dc6-4155-8ddd-b04eb57011ae/math_logic_puzzle_solver.pdf
    • https://s3.amazonaws.com/tidigudetefumof/31551419109.pdf
    • https://uploads.strikinglycdn.com/files/231874c4-2c08-4af5-b26f-6ed6416c31a7/penefamenowowuvunamikomi.pdf
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_fbc70cc2ba1243839e3548091726c2e6.pdf?index=true
    • https://s3.amazonaws.com/widofafane/genie_pro_screw_drive_garage_door_opener_problems.pdf
    • https://uploads.strikinglycdn.com/files/9017aff1-4c3c-4c5c-8c93-9fe5402d4e3a/automation_testing_interview_questions_and_answers_for_experienced_free_download.pdf
    • https://uploads.strikinglycdn.com/files/6ee1352c-f7c8-4a77-9dfe-a0347cec7852/food_calorie_chart_for_weight_loss.pdf
    • https://uploads.strikinglycdn.com/files/00f9eab3-b81f-4b0c-965b-0e96ee0193a7/nail_salon_open_late_jackson_ms.pdf
    • https://s3.amazonaws.com/kumasala/59727559137.pdf
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_25f730afa417477cb2939fffb0519ff9.pdf?index=true
    • https://s3.amazonaws.com/kulinisokakewi/fifty_shades_of_grey_plot_structure.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8fe.bin
056902ca2202204d6751bc6de24ac3780bcc7a138c354d38281609f66b24f95b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 5392 bytes
font_01_sfnt_off00010b2e.bin
eb022ed6f7161f0b0f76bf68dbce5cf42bcc44e81148d66d3edd22c8404fe0bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 10656 bytes
font_02_sfnt_off00012fb2.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB2 4324 bytes

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