Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e8d80cb8ef0539…

MALICIOUS

PDF

75.3 KB Created: 2021-10-03 13:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e96fa38618d77730480df76ccde849de SHA-1: 535392f1619e1e39978f5cac48d9b8cab649cc1c SHA-256: 18e8d80cb8ef0539c18d6d428563e798a2d2324e4d47a6171cdffdb53b66fd1f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links to disposable hosting, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://xz-brand.com/ckfinder/userfiles/files/89181023335.pdf In PDF document text
    • http://gelateriacool.it/userfiles/files/50436447149.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/gopumoputafolol.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e29e9a2fa---vubinot.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/17242612876.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/74405016661.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/26171407119.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/6737910379.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/51035320886.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/kuzomifoxudi.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20211003042730.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/67487141040.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/rukudamofulemavimaf.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb53ce422---21875109375.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/16677636418.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/wimubupebivukezexopo.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/navibolinoporibuvosisoj.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/xupegikukevub.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/14001793729.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/pujaruzadusim.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/93246881669.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/88046248355.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/39265003954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mustard+poultice+for+coughPDF 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_off0000bf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF30 18384 bytes
SHA-256: 18f1aea42f5de1d1e6e4715a52efd5307169f18a5e90c32ba49e2388ce599c3e
font_01_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 10888 bytes
SHA-256: 0dcc8ce8279b9e8e6012f3e66619918d6619157a34c873851dcca548d56be750

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