Malicious PDF — malware analysis report

Static analysis result for SHA-256 643b8d61d0a40db8…

MALICIOUS

PDF

73.9 KB Created: 2021-03-15 04:03:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca646ecbe9e8affb24c213e563cc4242 SHA-1: 96e47d1cda8934cc33def69150a9296f1f3f4b07 SHA-256: 643b8d61d0a40db8a6879cdacf7d3d3c7d1882832ff6adc144eeb360ad0ff8d0
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by heuristics as a potential external URI and flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains references to 'character creation warband' and application metadata, suggesting a lure. The primary IOC is the external URL which is likely used to deliver a secondary payload or conduct phishing.

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/wix?keyword=character+creation+warband
    • https://cdn-cms.f-static.net/uploads/4379222/normal_601f812cdd562.pdf
    • https://static.s123-cdn-static.com/uploads/4445735/normal_5fceb42dc3514.pdf
    • http://xovijezup.mywebcommunity.org/infinix_note_9_price_in_nigeria_slot.pdf
    • http://pebonemariv.mypressonline.com/jazugafupozenozas.pdf
    • http://xulenegutuwovi.iblogger.org/how_to_trade_bitcoin_on_webull.pdf
    • http://feludekinopotas.scienceontheweb.net/un_romance_irresistible_mary_balogh_descargar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_32fbaee0426b4dec8a015d1f20c887d1.pdf?index=true
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_1da501794883479ca57048f74426af22.pdf?index=true
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_e39771b654f14c8dbf01daca45b6b9af.pdf?index=true
    • http://penobugixova.atwebpages.com/is_there_a_samsung_smart_tv_remote_app.pdf
    • http://kolupus.epizy.com/how_do_i_recover_my_original_facebook_account.pdf
    • http://zasuridedowimam.rf.gd/zitele.pdf
    • http://gogewarixisude.epizy.com/48796419964.pdf
    • http://gadoxijumulop.epizy.com/bethlehem_nh_police_report.pdf
    • http://puwojewemuxa.epizy.com/sozed.pdf
    • http://tanofekomom.epizy.com/bhagavad_gita_chapter_3_sanskrit.pdf
    • http://folujas.epizy.com/kifopanu.pdf
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_65ebd295197340db9ffd4a6946edb49c.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_off0000e4ad.bin
cbd1ce0a0240b94986f981aaeb796d4376f58fa2814a701d9129ba570152ac69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 4956 bytes
font_01_sfnt_off0000f58b.bin
b3ff3cf6ccf63a40aa24ff0bab5d9f881b1c1b68e03839a642bbaace47a3a5b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 10848 bytes

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