Malicious PDF — malware analysis report

Static analysis result for SHA-256 8395903faa194606…

MALICIOUS

PDF

75.6 KB Created: 2021-02-27 11:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: daf9d54eddab296608b813d955ddc693 SHA-1: ca8d4491c5b1f690b5ce56895b4ef02550176927 SHA-256: 8395903faa1946064c0e1b76fb060a87c3649bb0ad1f422b3f0ab9b52a10f762
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://vilenefex.ru/aws?utm_term=what+is+modern+sword+fighting+called', which is likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=what+is+modern+sword+fighting+called PDF link annotation
    • http://somukegizos.66ghz.com/kingda_ka_roller_coaster_information.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/gjehgjc/57968768207.pdfIn PDF document text
    • http://hotita.space/are_all_wahl_chargers_the_samel3pwr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedisupekak.epizy.com/genunamis.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/37294964960.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/pavogidaverabinenotu.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/7966380749.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/3077196381.pdfIn PDF document text
    • http://nibudikugi.epizy.com/79788963616.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/93918579702.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/ulcerative_colitis_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/que_funcion_cumple_las_papilas_filiformes.pdfIn PDF document text
    • http://dujibagakag.epizy.com/38997820605.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/zelawerawuvagax.pdfIn PDF document text
    • http://novosumagib.epizy.com/cms_provider_billing_guidelines.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_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 5540 bytes
SHA-256: 00a9def78ded5dec66c96cc49aa8e78164fd545d44d4a6d14a9ce15baa38b75a
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 10212 bytes
SHA-256: 5f6c92f76fc5e29df33312e4c99e0308d26471426e5ec316f6ba9fbd71728df5

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