Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f5169e53d498b5…

MALICIOUS

PDF

75.9 KB Created: 2021-03-01 22:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 55640d6a63af675677d9904dc554ad05 SHA-1: 804c616fa0290430270bbfa3efef37b14883ee69 SHA-256: 87f5169e53d498b5de1a4564bcef741d61351e486667e2bc3cb543fd446b76d7
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URL, https://pelibifir.ru/wix?keyword=izaro+fight+guide, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains strings related to 'wkhtmltopdf' and 'fight guide', suggesting a lure.

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://pelibifir.ru/wix?keyword=izaro+fight+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474218/normal_60151865f217b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5ff7773825485.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417145/normal_600277769b8f6.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/eiijbgg/jeniwosapefopidogibijaka.pdfIn PDF document text
    • https://cdn.sqhk.co/jezofadu/jhgcif3/43384457793.pdfIn PDF document text
    • https://cdn.sqhk.co/gozawelesutu/ghAahjk/cressman_tool_boxes_at_lowes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492275/normal_601aafcb58249.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/bgdjhgh/77679598760.pdfIn PDF document text
    • https://cdn.sqhk.co/dilijenaka/jAhh2Zk/mexozuverikunowe.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/lusabifef/narolalaluvewazoduni.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/nufifujosizebipotipuxem.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/resumen_del_libro_1_de_la_republica_de_platon.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/45479820610.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/android_auto_fm_radio_app.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/ableton_live_9_manuale_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/boy_hairstyle_photo_free.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/68869398859.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_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 4944 bytes
SHA-256: 8dc12ecb04eb7aa19212d9d9580bb7de2528eaed84bf60c269f8290648a1d6f9
font_01_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 10876 bytes
SHA-256: 61b8ed746a67bea4aebad1767969b7bf361baa40c70f5e8d7b4e0735b658ea91

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