Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e1711d0dde7ad7…

MALICIOUS

PDF

84.3 KB Created: 2021-10-09 00:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 87b58e8b21568d6f2368e6eae28cd012 SHA-1: 8a8ead9bc6efb534ca43d97df36e54a5bff9b1b4 SHA-256: d8e1711d0dde7ad7331cba328d3796a7e80cc19b98b7178cf235d350b95612e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pataibicaj.hu/userfiles/file/16441725232.pdf In PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/zaxisakaboguviporufodinel.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/29752406566.pdfIn PDF document text
    • https://arsenev.verlauf-ekb.ru/admin/ckfinder/userfiles/files/69264358339.pdfIn PDF document text
    • http://freewest.at/nifitujumomemibowerogomor.pdfIn PDF document text
    • http://profstil.az/userfiles/file/gusenabukubupijojapob.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/soxobiten.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/tazebuduw.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/snf9rvauv7l94a7ptroadd0q6s/kavisilezupugurozi.pdfIn PDF document text
    • http://jiab.net/userData/board/file/devuwikazumovutisopatonu.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021100519480478.pdfIn PDF document text
    • http://videlec.be/ressource/file/garepa.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/boxuwibekulusafepepevot.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16150276a5c3d5---doxutakida.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/78459774008.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/fokijati.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/mubojutagizini.pdfIn PDF document text
    • https://stopserv.ru/files/file/69751927023.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210919_185935.pdfIn PDF document text
    • http://webantikvarium.eu/tmp/pesegotaniwefomali.pdfIn PDF document text
    • http://apple888.vn/luutru/files/33269896635.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-8/20210908031820769864.pdfIn PDF document text
    • http://nova-auto.com/upload/takonalepi.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/pajupekorewomuzapin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=chicken+salad+with+corn+and+mayoPDF 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_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 19940 bytes
SHA-256: b2b9469c5c342fc76bf7ea19d980db3b86e9aa1166eefeed866db74f0cfab8c0
font_01_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 10956 bytes
SHA-256: 5579be2c9ca7b326bc42f959b2d7beaa2206a803bbabb77ceb9417013e856b66
font_02_sfnt_off00012ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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