Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f824edae19453ca…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 19:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6cac6807fe3f682c3728b2034a8d2d2 SHA-1: c5b6f72cbb1d1386129a0307d6ba26e8bea3a237 SHA-256: 9f824edae19453cad934ff8f8b2113cf9855f38834f7b0652ee96d1593d14852
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URIs, many of which point to disposable domains, suggesting a link farm or phishing operation. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on potentially untrusted domains. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://www.aukuras.org/ckfinder/userfiles/files/sazosunukevifun.pdf In PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/samatoxikalozamurorijon.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/91488563523.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210918062835.pdfIn PDF document text
    • https://serka.com/serka/upload/files/vivojuniwolajajud.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/62319206102.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/vomudogarugezeforesinok.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/rasagibuj.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/ruvisisufibasofusabejes.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/wamezogugidosi.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/73669496328.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/dotudukufizezupolejisotix.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/95821051808.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109211544516422.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/838165913.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/zulugunozo.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/39356614986.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/97043862973.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/gibuvoviwasiremumuveritiz.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/mijepajesafaridokunonopu.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/gilirazulovajokuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=block+puzzle+box+apkPDF 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_off0000adae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAE 17312 bytes
SHA-256: 6cf797d1ad16e12be926bf909d2f1ebaa1e68f966fba3626c0589b77ea3bd824
font_01_sfnt_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 10352 bytes
SHA-256: ae1ca61ccd594ff1346ba719398fe3ff70a85cbc3eb262a97871d3bd05f40270
font_02_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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