Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44bf023b76127e6…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 05:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 833a5d17bdf09508022461c569dd5a51 SHA-1: de9a02f2c4a66c66f4dc477a1162b0dba8e40628 SHA-256: d44bf023b76127e60bbc769e8d1e39fb2d66f3dd6a9254c06ea96d0697fb8df6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://cdmvt.cz/sites/default/files/53680456810.pdf In PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/75660215573.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/82395704928.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4929f77d---wevetapigi.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/wufovajotiwusexizonu.pdfIn PDF document text
    • https://ags-car.com/upload/files/35164835955.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/92254128890.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/55578029421.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/mevemepajalobesunarado.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/33714603618.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109032145006908.pdfIn PDF document text
    • http://carszana.com/image/upload/File/miliwedutezewivawerojom.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/zofasifoxewazana.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/pevoxujofuweribefunopex.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/jibugup.pdfIn PDF document text
    • https://clickbox.ro/images/file/lizexagepagugolodebega.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/gefopiwevixaja.pdfIn PDF document text
    • https://2acontractor.it/images/file/fugovokirovozalikoxip.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/kezunalat.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/zexasofijenupul.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161353f612b591---wemuxeviparudidebijan.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///59721514593.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/80701838165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=who+visited+my+instagram+profile+onlinePDF 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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 17540 bytes
SHA-256: e52f2b19472cc7322a67049c923ffa09f1129364d4a3e9610b2b429acb0a1837
font_01_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 11120 bytes
SHA-256: 9cb0fa17eee032a7c14ca5518247039cd7c1e831201f89e7abf2d5f4c33f0f89
font_02_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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