Malicious PDF — malware analysis report

Static analysis result for SHA-256 be942ac45da8ed8a…

MALICIOUS

PDF

94.5 KB Created: 2021-09-22 15:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bcbdbea94c5fda63f46b17ab3ec3dc18 SHA-1: f00713f1864a12a3abe2e4931c72a4500d01ab58 SHA-256: be942ac45da8ed8ab43634f6dafc66017c8505a5e08f62afeaa0e6d278550a48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://rjt1.org/upload/files/76960710917.pdf In PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/jumulawepekupavuna.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/37005305648.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/fupotujozejojunijogawug.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/680022190.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/disufelinaliloxifu.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/72770172191.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/wijutupizulavomuxowev.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/turaruzokiwutovinus.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/6591856715.pdfIn PDF document text
    • http://zeci.nl/im/image/vurit.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/kudetib.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/61415755002.pdfIn PDF document text
    • https://robodom.si/files_vsebine/6369138354.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-18/20210918041025742364.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/vofurezexevolimeru.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/kesedaxevopezufomonok.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/xonokitezilutiwupuj.pdfIn PDF document text
    • http://urbariatprasice.sk/upload/file/19238241589.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/xitiperakaraveju.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/214e931bbffd99534de894a76be4369f/64494701260.pdfIn PDF document text
    • http://geodez.com/pliki/file/36119200071.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/24274778479.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7927e8ea3---37348665947.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/bexifuxanafolabafifejagim.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/54898514888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=is+there+anyway+to+know+who+is+looking+at+your+instagramPDF link annotation
    • 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_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 10896 bytes
SHA-256: d2d7076805948a71a790ed761eeda5653d1ff61061ef3ac914aa53ec6c49c3b0
font_01_sfnt_off000123aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 18472 bytes
SHA-256: 671a5145d5a23e42a0c8775bca4bfae9d59020020be626fe38b354302a38122d
font_02_sfnt_off0001534b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1534B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1