Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7443ea95c19986…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 21:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c2fbb8a327f5046b1b927bfafcdc611 SHA-1: 562fa803dbb31a32f50dc81471e7c82f1747f22b SHA-256: df7443ea95c19986ef26542e63e3bfcb970f9b1177741a0a4eb992cad09e2068
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF redirects to a large number of distinct hosts, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://elma-itc.ru/!upload/files/gujuzatuga.pdf In PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/nojoz.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/minogirasiwuvuxavolev.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/99899410252.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090807112839.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/19980968674.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/demijisag.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/nekozip.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/tapepotibakefu.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/babije.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/46721885746.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/hvbp3snmgabo1uafmh52es020m/69423345316.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16139f4da6f01e---jewamemutijunolirotebixi.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-16/20210916092343651553.pdfIn PDF document text
    • https://jagominum.com/contents/files/juwazamomipofifunixerome.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/60348234151.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/mekanodiwetetomugekolikit.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/disasatigadigapakabugoxaj.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210907194547.pdfIn PDF document text
    • http://brenderup.ro/mm/file/wegas.pdfIn PDF document text
    • https://badoza.net/userfiles/file/kexekixofapemowewuposetif.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/kilifugakavemilo.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/lixekavapiburuje.pdfIn PDF document text
    • https://nomortiga.com/contents/files/18076110217.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/livesawawogisoruv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tom+and+jerry+treasure+island+full+moviePDF 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_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 10888 bytes
SHA-256: c7bf7562c30298e05b3a64e8217ea0c5a15835f9a1672aac1e2c693d10f400b8
font_02_sfnt_off00011350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11350 17704 bytes
SHA-256: 96a1d5883318d3fa9bac446a1f54c15045fdeb44ede7ec7cf56638c39316889f