Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d241e0b85e0b640…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 22:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 802efca9d9c6d681894fcecabc97721d SHA-1: b8fcc82a5aa2b47cb906ee2e70e7083803d7008e SHA-256: 6d241e0b85e0b640938826d65f2e4e5f4b160569591af9836ed1cda6806cf8cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features numerous external URIs, with many pointing to potentially malicious or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://identik.hu/editor_up/dabukesefafuj.pdf In PDF document text
    • https://o-dance.com/upload/files/xovulekoxadajawusif.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/tatit.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/48173261093.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/fotubuvabexuvopapipudavum.pdfIn PDF document text
    • https://ismart99.net/upload/files/39415358598.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/34393686817.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/nujadaputipadanovadase.pdfIn PDF document text
    • https://pecsikult.hu/files/file/73429676907.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/zigonuxanafazezoxoxoz.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210903225941.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/vopuwoxodidulazepujijed.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/983475251.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26eeca80c---vedanirasudovu.pdfIn PDF document text
    • http://xhzhengli.com/upload/32178463692.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/39309572851.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109072033506843.pdfIn PDF document text
    • http://polipack.ru/content/file/27657640826.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/87254434822.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/risemi.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/030559287965.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109050446093154.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/22578861235.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/61431395986.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/91844935082.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/455edeac477eb891a330e27dac1d4bf2/laveputod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ear+hack+mod+apkPDF 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_off0000c4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BA 10216 bytes
SHA-256: 437481a691499b6d93c1cab74a43ff43fc71a6862ec3598a0051fffa6f9d0afe
font_01_sfnt_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 17452 bytes
SHA-256: f09edb12c796f91860bf0d443c3cee237f988947bc7dbe5f84f52331db840ccf
font_02_sfnt_off0001090e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1