Malicious PDF — malware analysis report

Static analysis result for SHA-256 e429f0c8a6c19e69…

MALICIOUS

PDF

78.6 KB Created: 2021-04-07 03:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 543090b0825e800d17e37f15a43aed34 SHA-1: 83920e025e30cb4c2a14b16266cc42680633e772 SHA-256: e429f0c8a6c19e6959c428e5b7b5a094380044391eb00ee06120ff5c5b0a492f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'jacksth.ru', suggesting a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/award?keyword=pepsi+logo+meaning+pdf
    • https://static.s123-cdn-static.com/uploads/4404753/normal_5feb48d82003c.pdf
    • https://cdn-cms.f-static.net/uploads/4453336/normal_6023774109129.pdf
    • http://nokirixako.iblogger.org/travel_guides_commentator.pdf
    • http://jobipelulimobo.iblogger.org/brawl_stars_apk_21._77.pdf
    • http://xuwurexem.22web.org/biology_syllabus_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_312a3452de8544cbbac2bc40b20361c0.pdf?index=true
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_c538a0ad394c451f809aa1dee9304651.pdf?index=true
    • https://43e3b293-20b6-4b74-9f7d-0eefffb4d2df.filesusr.com/ugd/11595e_6c06dcc908684ab6b0c01575e6484f46.pdf?index=true
    • https://90e68d66-75cd-4f9f-aa76-03b1e6b67b4d.filesusr.com/ugd/324cd8_7eda09df02b24872b3a15ad51987cdea.pdf?index=true
    • https://0f3c41ac-de96-4ba7-a517-026d7435d592.filesusr.com/ugd/8631de_89408e0defce41cbba7f6dc6e6cb161d.pdf?index=true
    • https://471876dd-1950-42f1-a4b7-18bccbaeda70.filesusr.com/ugd/5d8976_e32adf9784fd44e1afaf62a880877cac.pdf?index=true
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_a610c528c90740a6a3ae6ae3e4c7ece2.pdf?index=true
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_afa1752416ba4f7e9ca78ced9dfd5dba.pdf?index=true
    • https://eeff404e-5492-4914-a1d7-e39d1f35e6b2.filesusr.com/ugd/e58d70_1b8c81ab996244039affa4314428ece9.pdf?index=true
    • https://264cdfe8-48fc-440e-bff3-938583425051.filesusr.com/ugd/cd20dc_72862cb0144b4a1baa4934e26581a329.pdf?index=true
    • http://varakofobugomo.rf.gd/98261096656.pdf
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_aba16c6a7e904659adab1009c1d9f0bf.pdf?index=true
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_c297dbaae0034277988c4f2925095b2b.pdf?index=true
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_571a058f494b4571a6c99c6bc8538480.pdf?index=true
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_a9eb60b5f77d463b81c501c6c6cd7783.pdf?index=true
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_af3d3acafdd64c988b1fefcb71a49fa0.pdf?index=true
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_0e9f580a74f247b28169fcd66fef1f7e.pdf?index=true
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_1af3e2077960450c9abae26582c059cf.pdf?index=true
    • 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_off0000f6b6.bin
c06a4122d7b92dfa06a5ee788bea8ad3d7cebd75fb92dda0e27da16ac06743c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 5268 bytes
font_01_sfnt_off0001088f.bin
9c16b4626f466ad74523ace1f613e2e66f5671eb3cfec40908c707a938be57df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 10312 bytes

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