Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5db96b8f6a3daba…

MALICIOUS

PDF

94.1 KB Created: 2021-09-14 04:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1908d27128a264cde89829a86182881c SHA-1: 499ec0a47a17dea8172a243d5cfa246073efdb44 SHA-256: d5db96b8f6a3daba9a2115a7f8ee4f508cb2f638bf0b1b58c71bf13e5040e973
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://synerhu.ru/uplcv?utm_term=pokemon+ultra+moon+rom+citra+android PDF link annotation
    • https://rizecanreklam.com/images/file/ruvedazenawedidedifexul.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/41594689523.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/nepixugemaxo.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210911130756.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/66180157436.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/22868512717.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/14947346354.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/21719434795.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9d596397c---11688065648.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/73146384326.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/3091968000.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/kigopomipigixatu.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/77736410355.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/8269185452.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/36730310521.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/14512780995.pdfIn PDF document text
    • https://tele-video.ru/upload/files/21269999114.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/3287196065.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/nukatogixozasixipasu.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/tenuwiwetulekujab.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/megeradalokowu.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_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 10556 bytes
SHA-256: ee7cb18cefa7781aa3265ec3a0e763f63882d50f66fac1fe394d0dc917219c56
font_02_sfnt_off00013b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B28 18344 bytes
SHA-256: bb3a7ea0b3fbaf1ec1f8fd4823f0e2313b6df9028ff318051c44a2c3dfccb8ac

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