Malicious PDF — malware analysis report

Static analysis result for SHA-256 e142daf6e4fb7d5f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 13:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78d1b267975dfaa5e879673070d3ca1a SHA-1: 9a7e8b9ff013023d052c133fb8011d3267ab869e SHA-256: e142daf6e4fb7d5fc33fcdbda3d5da2786b904a525c9cfd3247d9446b86a152a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript, which is often used to redirect users to malicious sites or exploit vulnerabilities. The presence of numerous external URIs, many of which appear to be part of a link farm on disposable hosting, further indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=telecharge+jeu+android PDF link annotation
    • https://kaptenhoki.com/contents/files/46749027002.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/99066915174.pdfIn PDF document text
    • http://www.77ice.com/upload/files/kasogewewedezo.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/fudof.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/87912701223.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/riruzapomexix.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-6/20210906133811278218.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/fekefevejoli.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///55715394434.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/lasigudojifemurisapojiruz.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/16428120796.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/difivunasisofi.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/63401802056.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/45947263772.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/xujutupa.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/kovigopugivovezokejuvemem.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/63296050777.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c7f0c27504---31852198723.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/durasowetozet.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/punatozifujaririror.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/13/vikufofuvodozurisonamogas.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/33836662404.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/visebufexejasoruzur.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/wujubiza.pdfIn PDF document text
    • https://virker-ikke.dk/files/20803310882.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ac65e0bd6---vopaxiwuz.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_off0000d4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A7 18532 bytes
SHA-256: 01c2488f89389fb9c094f7d0186cfcd01a117151c3fb98819cfbf55798f65e38
font_01_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 10576 bytes
SHA-256: fc7117d94a7f60f47fb96fbe6a1d937150da5893c496cea848442f2460ae8eff
font_02_sfnt_off00011b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1