Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5a29a95a3a47ae…

MALICIOUS

PDF

81.6 KB Created: 2021-04-07 13:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 17af2434cb71d6bcd3508ee051b4a69b SHA-1: 514d97ac2337bd5692d55021fce0c265944980a3 SHA-256: ce5a29a95a3a47ae873dcf7ad5a3aa55ebf1250aa96e8cbfd1c0b1b7af5a2a96
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/strik?utm_term=how+much+does+model+3+cost+to+charge PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498883/normal_6034a1c97742e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458431/normal_602b24c497189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426556/normal_604f64680b0ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446944/normal_5fee12655d6b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_600fab683fdea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368982/normal_5feb6b125588f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_60544a7c956fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_60559d30ce9e7.pdfIn PDF document text
    • http://vutomifewomisub.iblogger.org/nevimotezoxijapok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497638/normal_605b74ec91ab4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389797/normal_5ff06f4b91bbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xazitew.epizy.com/66029235305.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/annual_salary_certificate_format_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/couper_adobe.pdfIn PDF document text
    • http://wofeginu.rf.gd/will_a_failed_pre_employment_drug_test.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_366c396701a04111a055a89100f4841c.pdf?index=trueIn PDF document text
    • https://d6a293f2-6876-493d-91b7-c13182b05023.filesusr.com/ugd/bcaa7e_2f369544820b48788f535d70ce70d4b0.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_a843b893b8544338b3650fa08db5a55f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/centrifugal_pump_ppt_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/begipok.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/ccc_ka_full_form_name.pdfIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_c477b99b977e4a55a6499383c0096270.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_b5bffd70327543e7807c026ec0a4fb88.pdf?index=trueIn PDF document text
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_ab1a9c5fcb48433a81967d669d99de27.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 5568 bytes
SHA-256: 0bb6b2af41f8f44b72f9c33b15c19c23e8f151ac5e492ccfdd7f4af11f610cbe
font_01_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 11052 bytes
SHA-256: 425096687464d5fd5a4431585154f745a56c13b197d334ffbb694ad21cdbec98