Malicious PDF — malware analysis report

Static analysis result for SHA-256 941cb1302cda5c70…

MALICIOUS

PDF

76.9 KB Created: 2021-02-27 03:04:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9e88bb4c3fb48f5f4d458da951c42667 SHA-1: 5011fefa8803338eeb52ec08276c012dc6befd7d SHA-256: 941cb1302cda5c706601dbc79f20a64fec2bd7dbd855e692b2be5d87f67389d9
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://vilenefex.ru/wix?keyword=narrative+text+type', which is likely used to deliver a secondary payload or conduct phishing. The document body is heavily obfuscated, suggesting an attempt to hide its true purpose.

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=narrative+text+type PDF link annotation
    • https://cdn.sqhk.co/verexoleki/buwkJjj/66822532595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465396/normal_5fd8646993cd7.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/irobot_roomba_s9_black_friday.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/who_writes_the_script_for_the_big_bang_theory.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449417/normal_60345db3a4edb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418574/normal_6028f395dc195.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/pesanuzibijixenidajubiso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393220/normal_5feb8d9e4b06e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/bull_bull_kannada_film_songs_free.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/marine_corps_physical_fitness_program_mco.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/android_x86_vmware_screen_resolution.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/wozemaxipo.pdfIn PDF document text
    • http://jorelodifi.rf.gd/posata.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/81310069076.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/apptoko_clash_of_clans_mod_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 4804 bytes
SHA-256: 3213e1ee7caa8f79fc5358440d9ab0390888ccf3f405295b86dd42458721044e
font_01_sfnt_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 10276 bytes
SHA-256: 7c8aa793990e9fdb6803983756f5e1c72c208549bdd3eea96b9867c73da8bf01

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