Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7fea04d6ce9d2b…

MALICIOUS

PDF

72.1 KB Created: 2021-03-03 12:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8c54d4c76295f2dcad24bd0fff00679c SHA-1: 2bef9caca70333550da074955098ac6ca2954d54 SHA-256: 4e7fea04d6ce9d2bac2781f1e498cc891ffc2814510d4baeef5cc45715507b51
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates the document likely uses social engineering to prompt the user to press Win+R or paste a command, a common tactic for bypassing macro restrictions and executing arbitrary code. The embedded URL 'https://nipisod.ru/strik?utm_term=what+does+it+mean+that+driver+is+unavailable' is likely used to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://nipisod.ru/strik?utm_term=what+does+it+mean+that+driver+is+unavailable PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461481/normal_60010a5f34db2.pdfIn PDF document text
    • http://exampl1214.com/comptia_a_passing_scoreuvvvs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371553/normal_5ff9e7a4382aa.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/rgjJpAr/86308680715.pdfIn PDF document text
    • http://neuroncraft.online/81036393456e9jjn.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/what_anime_is_one_punch_man_from.pdfIn PDF document text
    • http://meblik.su/66703693580pot6i.pdfIn PDF document text
    • http://zubiki.top/658003143305uco8.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/Dg7hdus/fill_color_in_excel_based_on_a_value.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/jcphcOO/car_mechanic_school_online.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/vitelitubovuluj/nuzunowumetatunawuv.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/kobalt_30_gallon_air_compressor_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/45038167584.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/amazon_kindle_android_text_to_speech.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/26834795280.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/aldi_shopping_app_for_android.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_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 5276 bytes
SHA-256: ddf58c746d4a6977ab55d61b11f3fa63a1ba40fa04702e269082abf073cd59a2
font_01_sfnt_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 11076 bytes
SHA-256: 45f728660962f217c1e4079a00c3185386d6921be4333e51b2dcaab68a79c01f

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