Malicious PDF — malware analysis report

Static analysis result for SHA-256 8667f1eb423c045b…

MALICIOUS

PDF

73.2 KB Created: 2021-09-27 08:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b8653f90d512ba53e2626f0489127bc SHA-1: 5160fd06d0780f1d3f5d2f57d38ea8864a7cdbba SHA-256: 8667f1eb423c045be164c07d7ccf3f3f1fb8d56df726d1a910af1d5ea38efab8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links designed to appear legitimate but lead to potentially malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=free+spy+software+for+android+cell+phones PDF link annotation
    • http://huile-de-nigelle.info/userfiles/file/63913445578.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bc33237eeaec7022884c203053c940ca/59355965195.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/doboxepoj.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/betolinutinaxig.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/zenefabaxokitokowobi.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/31630115212.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///vepewolaripeguwade.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/44470309313.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/89612541027.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/18460159845.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/niduburaf.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/75400402470.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/17788103781.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/58286247786.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/regovunutuwep.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/xosilibinipalobiw.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/zefawepulokibijetezo.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/50947828614.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/rodigawenexarugadejazijog.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/77126341241.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/zugaroz.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/jugajedozulateremeb.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/56252593008.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/zagagefojewo.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/gomofugaradixo.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_off0000b5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E8 17800 bytes
SHA-256: 847941a8f7b4272fe38b7c98c6258f70ef808af0db1a92194035b42d2f731985
font_01_sfnt_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 10892 bytes
SHA-256: c4be9b442c83543be65176d99787ba9568f5c3922d886e0aa180cbfedf5a9151