Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8e061a0e2fd132…

MALICIOUS

PDF

78.0 KB Created: 2021-04-01 04:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1b3133ea687c66929f4217b2fc47c3a6 SHA-1: 2eb38d46578ac8a6219aa83a8a583a3007ab24c3 SHA-256: 9a8e061a0e2fd132e3b1e72212d001df4b4597829d8134e3e76e7bccde2b63a6
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL, identified by heuristics as an external URI and an embedded URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains references to 'Starfinder flip mat pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The primary malicious URL identified is https://mezovuduw.ru/strik.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/strik?utm_term=starfinder+flip+mat+pdf PDF link annotation
    • https://cdn.sqhk.co/zutomina/hajjhbv/riwodajogobot.pdfIn PDF document text
    • http://tuzevijubozor.mywebcommunity.org/rebukamakabob.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/lrhiNu7/live_price_of_crude_oil_in_mcx.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/sistema_renina_angiotensina_aldosterona_fisiopatologia.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/9zlAjaf/juwidawinutekoj.pdfIn PDF document text
    • http://vegunax.getenjoyment.net/keruwa.pdfIn PDF document text
    • http://xaredazisom.mywebcommunity.org/21026447114.pdfIn PDF document text
    • https://cdn.sqhk.co/segidexu/gdiglI4/fb_video_downloader_apk_no_ads.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/59987332528.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/81014890880.pdfIn PDF document text
    • http://ragaliteres.iblogger.org/jaspersoft_studio_interactive_reports.pdfIn PDF document text
    • https://cdn.sqhk.co/livujiguf/dCWEhjF/6279996926.pdfIn PDF document text
    • http://mimivudarevi.scienceontheweb.net/analogy_reasoning_questions.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/gawabog/afib_treatment_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/how_to_practice_wing_chun_alone.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/xirodirasifabukafib.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/36151014836.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/tujifopefomivosimavidoxat.pdfIn PDF document text
    • http://tagugatukosag.epizy.com/xaderegufagav.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/handwriting_worksheets_year_2.pdfIn PDF document text
    • http://nanesipub.rf.gd/emergency_reporting_procedures.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/livixesozowepiz.pdfIn PDF document text
    • http://bamonoxo.onlinewebshop.net/wagijabijozusatagelejam.pdfIn PDF document text
    • http://woporebokut.rf.gd/ziwir.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/norulevitisefis.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_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 5112 bytes
SHA-256: a3e5ddc06ee758d63c01fe9a704de26c7494915d76de63b0f1bc09d1fac9f6a7
font_01_sfnt_off00010264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10264 12188 bytes
SHA-256: 9931909a657b42dfb0cbeadf2f6df9e927d353f9cc51a2715e5e57db57f7c22d

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