Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fd81908b772852…

MALICIOUS

PDF

75.1 KB Created: 2021-09-09 22:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de162d96f6db5b366f5183ef3dbfdd07 SHA-1: 3d2d766f8c68e23a8acb8ff1e54a5289ccd903a4 SHA-256: 98fd81908b77285213cd228addd8209133391c340fe351289edb6356fad06aab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to potentially malicious sites. ClamAV detection as Pdf.Phishing.Trojan further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://xinpayflow.com/ckfinder/userfiles/files/pitapone.pdf In PDF document text
    • https://shevtsov-art.com/uploads/files/40207656209.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/seketa.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65226725855.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/90459951437.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/ranitafanepusosodip.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/modifutiroxeko.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/39411895991.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/nudivixeve.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/vuvapotadusarozejobokinuz.pdfIn PDF document text
    • http://boki.hu/editor_up/25818251572.pdfIn PDF document text
    • http://chapelguild.com/images/usr/ruzebojowowuridanuvivora.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/nupozatonozib.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/43358554992.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/magoruwikosuxevo.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/33817962489.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/ganukojagoru.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/61062472554.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/2620816855.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131269b7e806---98133706016.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cssn1ociehq2s2lahg5gh30u23/gamuduw.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/20741672560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=histology+pawlina+pdfPDF 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_off0000c1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C3 10632 bytes
SHA-256: 6da4b98553faebf413fb1c934034166bddc0d92720a9b5a170b383e8244848ac
font_01_sfnt_off0000da0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0B 17572 bytes
SHA-256: 1da02dccb9d979d356fcc1988f64e0833226080ce7c5b4dd74c88bd128b1cfdf
font_02_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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