Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48f991a55f6198c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 15:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6637df83808bd8639a4e1a0a6b51e7db SHA-1: 69b68187e9b683600303135c96a5dddddd3642c8 SHA-256: f48f991a55f6198cef7b750921fefb26274fc0fc3e157fdf915d249838eeab8a
134 Risk Score

Malware Insights

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

The sample was flagged by a critical ClamAV detection and an ML classifier as malicious. It contains embedded JavaScript, which is a common technique for downloading and executing further malicious content. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious or disposable domains, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://weingut-suppan.at/files/fovupevodikiwaxorim.pdf In PDF document text
    • http://pillshop.ru/uimg/files/71655808182.pdfIn PDF document text
    • http://fruitsad.pl/images/file/nuvemaforodojadavi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/11564807777.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/65092476113.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/33292214712.pdfIn PDF document text
    • http://ledins.lv/cms/file/57613860433.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/69078058453.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/21978976636.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/jefunanosovelef.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/busigemuzigurikope.pdfIn PDF document text
    • https://chptravel.ir/data/file/16102538197.pdfIn PDF document text
    • http://1careglobal.com/upload/files/30596003259.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/tipowotilubibex.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161339445f3f25---32443588954.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/937620072.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9a870ce629b73dd9098b721769b6ff5f/wabibojizobupuziwufil.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210909161950.pdfIn PDF document text
    • https://lordoptika.hu/files/files/podiponinutet.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/duxuvaterumasubiwalijoso.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/21741452155.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/41571519132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lorax+movie+streamingPDF 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_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 10528 bytes
SHA-256: b25a2929d54c6ad79edd895d4d7be0c7dd8b70bf46a4382107169426dd9d99ea
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA6 17812 bytes
SHA-256: 315b7ebcdf62e621459b59c9a32979bb8ed0bbf1f126e1ff8bc9d5ef15530933

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