Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04c35f77bf2c8c8…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 12:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0692c0402ba525503192977ea57af38c SHA-1: a0e0bd305148da468eb5085862649e61d49da6d0 SHA-256: e04c35f77bf2c8c81e1b5007c929e33ee7ad030109b579aa932228a8872ff4b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users to malicious content. The presence of external URIs and the link farm structure strongly suggest an intent to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pistant.ru/uplcv?utm_term=offline+arcade+games+for+android PDF link annotation
    • http://immodraft.de/images/architekten_agentur_images_/file/zaruxinipowupotitiz.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/36032338211.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/71773177638.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/venezilenisabexok.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/gikuj.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/27916803857.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/gesiwotaripesilaw.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/82583125830.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/66208625504.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/93394024163.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/bedafetagugoluginu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/14293589810.pdfIn PDF document text
    • http://taigesw.com/upload/files/38591527858.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/55352732736.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/bupixomoxividorile.pdfIn PDF document text
    • http://rilta.net/userfiles/files/litixobinafupufafug.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/juzigotepemokodogav.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/22251409855.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/tepedikukupulir.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/dodazipafeb.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/xiranijejodozekegida.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/jiwapikevogamefopasif.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/19546814463.pdfIn PDF document text
    • http://nanopena.cz/upload/file/27342026437.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/40324589473.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB327 15408 bytes
SHA-256: a4130e7ecb6623e7ac0c12d42fc1fb945ca194bd2268242db304482d2b0fb7c0
font_01_sfnt_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 10748 bytes
SHA-256: 28929c5d18619c60391d510d895d36a2f7dd3e9476f4aa32410f776172741c8f

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