Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7bae48b4745e2a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-11 01:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8437c1b787dd33172709c1b5163d87a6 SHA-1: daf873e4c719ad04f9ac5fb8dff5dd74aca927a1 SHA-256: 3c7bae48b4745e2aa6c5757365398c0b9d05879297779bbb1f287be1f9100342
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to distribute phishing content or further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aykutemlak.com/upload/ckfinder/files/menubesinadi.pdf In PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5829ef17e---zasejevisoz.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/85254358046.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/kodisekixaxak.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/97540669115.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/83534591322.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/23535811495.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/wafapef.pdfIn PDF document text
    • https://htchninc.com/d/files/12706872414.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/31616463934.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/71149280289.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/vezozoguxujok.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/soxigopede.pdfIn PDF document text
    • http://minipit.com/data/files/48524236060.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/14226847316.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/62511924065.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/8056b0bd339746c35e2c13047b6f221a/roforebajuzox.pdfIn PDF document text
    • http://chikatere.com/Upload/files/totujiluf.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/99541849524.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/kazibigatiruwipug.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/vosaxikazosaxivage.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/verafemulora.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/63699729458.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/subuwepetulasevirawe.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/siripubomela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=photo+edit+app+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_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 10164 bytes
SHA-256: 7e5d15bbe419e060b6ea8271317e57a8b526aba991c384a6f019f44c085adebd
font_01_sfnt_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 17208 bytes
SHA-256: cf98493ad6181e2b7c46eb075d23fc580d9775d89c26eea563c417ccdb6fd163
font_02_sfnt_off000126c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1