Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fdc2783b8cbafb…

MALICIOUS

PDF

87.1 KB Created: 2021-02-27 22:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f68c1e56912715d626702d2ee4b631fa SHA-1: f75ac00800f5b00c7b9ff41f84bd0956a78feb11 SHA-256: a0fdc2783b8cbafb01885c8c9a3b03a0ea0440a1e999008923841523f35c846b
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains an embedded external URI pointing to 'vilenefex.ru', which is a strong indicator of a phishing or malware distribution attempt. The PDF structure also shows signs of manipulation with duplicate object bodies, suggesting an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/aws?utm_term=does+the+bible+say+do+not+fear+365+times PDF link annotation
    • http://tewajaz.iblogger.org/50690666723.pdfIn PDF document text
    • http://trelon.fun/noribexufenunsly0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467038/normal_5fc72bc5e7537.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/tiwozotufe0i0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504047/normal_5fcbce517960e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_5ff363ba9d928.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/UcpfibI/blazing_star_apk_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369663/normal_600488d59cda9.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/Viezgjx/74596521899.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/jbxuhfr/kaxoni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lemibutudigosuv.rf.gd/how_to_remove_kidde_carbon_monoxide_alarm.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/94217927014.pdfIn PDF document text
    • http://danofef.rf.gd/33035772944.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/primarias_pnp_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/mivida_master_plan.pdfIn 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_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 5828 bytes
SHA-256: 0b94f3115f547839878ee39bcf07f6270bfcb6fc44908438ddb41a8a838e2965
font_01_sfnt_off000129a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A8 10540 bytes
SHA-256: 2fb12aa570431c7029f66913f4bf2ccbdb8c03e616075407da54fb4a8f2a0d0a