Malicious PDF — malware analysis report

Static analysis result for SHA-256 d476f40054c6fc01…

MALICIOUS

PDF

78.9 KB Created: 2021-04-08 23:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b93d7800cad178b5bcd5c9491b3c572c SHA-1: 21bd89504564013d5dd5a77ce066b82613428a32 SHA-256: d476f40054c6fc013ca95a9b61bc28bf811b03dd6376abb05789dc4b59fbea7f
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating it is designed to host numerous external links. One of these links, https://vilenefex.ru/strik?utm_term=john+deere+number+5+sickle+mower+parts+diagram, is presented as a search result for tractor parts, likely a lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/strik?utm_term=john+deere+number+5+sickle+mower+parts+diagram
    • https://static.s123-cdn-static.com/uploads/4369189/normal_5fe210a8a78fe.pdf
    • https://fuzipoxo.weebly.com/uploads/1/3/0/8/130873840/2770155.pdf
    • https://gavixidosoxadi.weebly.com/uploads/1/3/0/7/130776067/deguxikiliw_ropadiluwuz_nofasewiba.pdf
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/ea0cc4.pdf
    • https://cdn-cms.f-static.net/uploads/4459937/normal_606d698deb073.pdf
    • https://cdn-cms.f-static.net/uploads/4470040/normal_5fd3448cb3477.pdf
    • https://gikanusubidi.weebly.com/uploads/1/3/4/7/134756500/5042df7477b0.pdf
    • https://cdn-cms.f-static.net/uploads/4449605/normal_6045068a6709b.pdf
    • https://gulapizebulo.weebly.com/uploads/1/3/1/0/131070336/juxasivabuvusub.pdf
    • https://cdn-cms.f-static.net/uploads/4403410/normal_602026971a623.pdf
    • https://static.s123-cdn-static.com/uploads/4426549/normal_5ffdb76ccf591.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nagudo/funeral_invitation_template_psd.pdf
    • https://s3.amazonaws.com/wulagisi/basic_electrical_and_electronics_components.pdf
    • https://s3.amazonaws.com/poguvelefa/visasetuveropugebibibiv.pdf
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_a1cecf22d3314705823de8b771500785.pdf?index=true
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_fe0cf6ea1d3f4820a2242679495941f2.pdf?index=true
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_990af074f1a24059b52a2617db65adc4.pdf?index=true
    • https://s3.amazonaws.com/nosepevozux/global_competitiveness_report_weforum.pdf
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_ea229edd3de443b495f89ff581a5f177.pdf?index=true
    • https://s3.amazonaws.com/kafises/43248811165.pdf
    • https://s3.amazonaws.com/wujodibu/year_3_maths_worksheets_free_printable.pdf
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_7f6e83dcddde448db57c2471f5370ea1.pdf?index=true
    • https://s3.amazonaws.com/dekogamik/luxigisezile.pdf
    • https://s3.amazonaws.com/jakujakula/98976674822.pdf
    • https://s3.amazonaws.com/putelekireza/kokerolavolotum.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_off0000f16d.bin
103770d7e0d3394cea6c5e0239319c71a3858fda5f83b8382c2626ec43b68c38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 5896 bytes
font_01_sfnt_off0001055b.bin
4424c57ca2463bde362f1a06c7cba2f58325c28a2b63b93defb871876d46603b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 11948 bytes

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