Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb904bd92b34857…

MALICIOUS

PDF

67.4 KB Created: 2021-04-11 19:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2116c4a23bef58cae909cb5325a7a1d7 SHA-1: 2f4d98229ecd6eea0179650acd1c2e35a750db12 SHA-256: 4eb904bd92b348577559d3715a78ea9f4b1051179cf855ced2ab81c917a000ce
96 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host a phishing page or a second-stage payload. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external links strongly suggests a malicious intent.

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/strik?utm_term=dell+latitude+e5500+power+supply
    • https://cdn.sqhk.co/figoveraboj/gXjdBVs/how_to_make_fit_the_fat_2_skinny.pdf
    • https://cdn.sqhk.co/rarirawibowo/Sjansjj/66503739296.pdf
    • http://ritegifufefut.scienceontheweb.net/kefux.pdf
    • https://cdn-cms.f-static.net/uploads/4367940/normal_6067f25f9d118.pdf
    • http://xasefosixojoloj.iblogger.org/wachet_auf_ruft_uns_die_stimme_bwv_140.pdf
    • https://cdn.sqhk.co/jesovolavig/hegfGpK/zikituvapavubinediwub.pdf
    • http://nozozofodedeza.iblogger.org/initiation_ceremonies_in_zambia.pdf
    • https://cdn.sqhk.co/libibajuzumu/jhdchip/jozixigumurawibowar.pdf
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5fda5a528f77a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wutebanik.epizy.com/banner_editor_app.pdf
    • http://suginutowukig.rf.gd/latest_java_free_for_windows_xp.pdf
    • https://s3.amazonaws.com/bifamomove/rojidebedebifezebiwesu.pdf
    • https://s3.amazonaws.com/gekojulog/xesip.pdf
    • http://padusij.onlinewebshop.net/apprendre__mieux_parler_le_franais.pdf
    • http://ravigokabuf.rf.gd/leveled_literacy_intervention_lesson_plan_template.pdf
    • https://s3.amazonaws.com/perurulexi/34392854414.pdf
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_20ed28d53ee94d8490d0caee28111f4c.pdf?index=true
    • https://s3.amazonaws.com/tevigotu/96645119623.pdf
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_fc45aae379f64ac8a60717b76dc3992f.pdf?index=true
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_faf6a54fdf6d44eeaa16811c16846dab.pdf?index=true
    • 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_off0000c795.bin
07d6e79db673cd06a0889b6a26a211414e3c38c50f38aafb5dafb056d2c4d0c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC795 5412 bytes
font_01_sfnt_off0000da24.bin
a0b9563831fe3afb2f21ce91584f55fdfb6512adb476b461f9f2448b3b70c347
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA24 11384 bytes