Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ead6bac1a57df9…

MALICIOUS

PDF

78.0 KB Created: 2021-04-07 00:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4ac83038a62e878d6bf424b7c554efe SHA-1: 2458a1319ef5e6faec57249ba05ed354e1c3bc0d SHA-256: 36ead6bac1a57df9cca16bc5ecc7635caa536467e5c8a4fb96a08fb900e19465
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a link farm, suggests the document is designed to redirect users to potentially harmful websites. The authoring application 'wkhtmltopdf' and the embedded link farm heuristic point towards a phishing or SEO spam campaign.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=pathfinder+kingdom+building
    • https://cdn.sqhk.co/rigowodikot/hjGvI0C/nusezafavoras.pdf
    • https://cdn.sqhk.co/talurelope/jhbiakp/52344880173.pdf
    • http://wwbook.org/new_ranger_boats_for_sale_near_mep86xl.pdf
    • http://lightsex.ru/my_cloud_home_apple_tv_app5u0x0.pdf
    • https://cdn.sqhk.co/nifodotiriru/iho4Thd/73646710338.pdf
    • http://kujubawakini.22web.org/noripotelapigiwogeje.pdf
    • http://reduslim-official.website/bolotajiginalelab7j71g.pdf
    • https://cdn.sqhk.co/zebenane/c25ggyl/83859513236.pdf
    • http://wobidujisix.iblogger.org/sokawejosuwazuteko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6ebaaa6-6a3e-40e8-8b15-510c2139f971/85269220288.pdf
    • https://uploads.strikinglycdn.com/files/7e0aedab-7dfe-446d-8b09-ef1da34a93ad/84049712377.pdf
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_3eecfabc22e840df93f7235d82bc323a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e25310e3-95e3-46a6-9549-2817b03b4d5e/what_is_the_coldest_capital_city_in_december.pdf
    • https://uploads.strikinglycdn.com/files/367ec987-ca7f-4630-a795-1ba590aee4a5/zawizabowanazezopiwel.pdf
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_e3dacda4b21749a68c3049bd20710763.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f4feabae-32f3-4462-bfe3-4ff8c7c87f12/best_simple_tomato_sauce_recipe.pdf
    • https://uploads.strikinglycdn.com/files/f6a30fc6-be4c-4b78-89f8-82df2338377a/pisodomawozob.pdf
    • https://uploads.strikinglycdn.com/files/1c91904e-1d3f-4adc-aabf-a6128e9fc254/how_to_take_screenshots_on_lg.pdf
    • http://laxizal.epizy.com/boodhi_kaki_premchand.pdf
    • https://uploads.strikinglycdn.com/files/252242a7-3256-4550-a9a0-67db34c2d702/python_logical_operators_if_statement.pdf
    • http://pesipobigon.rf.gd/business_model_innovation_book.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_off0000f40d.bin
c3b4d684b0ba23bd92c797577f7b789326b1299354ad807b6522449613594722		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 5348 bytes
font_01_sfnt_off00010616.bin
6bbe856523704e506b22d165b30682dcf8fbc2af9ca61591aa856712a4578aac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 10784 bytes

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