Malicious PDF — malware analysis report

Static analysis result for SHA-256 a859407418c77e76…

MALICIOUS

PDF

77.8 KB Created: 2021-03-20 22:35:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d3cea882b7ce1a459305d4e0e47d291 SHA-1: 2f074c4f6ed90f9848324a8952246b20335000df SHA-256: a859407418c77e768f5a6f98f8c36aed38c62f3e2497e27a01d02861590e059b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://nipisod.ru/strik?utm_term=oa+grey+sheet', which is likely used to redirect users to malicious content. The presence of embedded URLs and the ClamAV detection further support its malicious nature, suggesting it's a phishing or SEO spam document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=oa+grey+sheet
    • https://static.s123-cdn-static.com/uploads/4483837/normal_5feb5cb8d78d3.pdf
    • https://cdn-cms.f-static.net/uploads/4408997/normal_60477ba29a10e.pdf
    • https://cdn-cms.f-static.net/uploads/4403948/normal_6046346852e4c.pdf
    • https://static.s123-cdn-static.com/uploads/4422645/normal_5fde5754b0fcd.pdf
    • http://hookup682.site/hp_pavilion_dv6000_manual_portuguesv9fhq.pdf
    • http://expressday.online/is_ruger_sr9_a_good_gun0189e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zukogi/45230504813.pdf
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_d1b21fa0e619430290655e2d357976ac.pdf?index=true
    • https://s3.amazonaws.com/nijosinizo/jaxugalulap.pdf
    • https://4db61c00-1078-4917-8a1c-a2c1480eb6e0.filesusr.com/ugd/c94206_bb407b88ae734038a331a5dd6752c64a.pdf?index=true
    • https://s3.amazonaws.com/tumasun/seraferelefatepuxuzaz.pdf
    • https://s3.amazonaws.com/sefiwegegagu/molarity_and_dilution_practice_problems_answers.pdf
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_015580e0f18849aba68306e5cd0874f1.pdf?index=true
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_aea04d81433246d98e8af20d310f53ed.pdf?index=true
    • https://s3.amazonaws.com/bezegoluzose/good_night_image_with_love_couple.pdf
    • https://s3.amazonaws.com/nemafu/rakekuburemolasubutojero.pdf
    • https://s3.amazonaws.com/dejolavubukugeb/170128902.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/microsoft_excel_ledger_template_free.pdf
    • https://s3.amazonaws.com/jeponowon/ashrae_fundamentals_handbook_2013.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_off0000f3ac.bin
95406d75ff01a454dce878803d07ca3cfe2651f80b577b4f29494d61c8c2ea96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 5044 bytes
font_01_sfnt_off000104d6.bin
9d64524b3b5022a04108cbe66a0dbc49f4d9cf5e6a1d5a98a6c679ec4345f1d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 11140 bytes

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