Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46c2944ccb8bd2d…

MALICIOUS

PDF

74.2 KB Created: 2021-09-22 17:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8390c38f42d1126b8f293c2c785ca65a SHA-1: 69990450b92b51683d8583dfa2b58877e3309e1c SHA-256: f46c2944ccb8bd2d31ab9658c6b6b890ac865ab6aab061e23e37287e1c1408f7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest a phishing or scam attempt, aiming to direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://oniceh.ru/uplcv?utm_term=physics+for+scientists+and+engineers+9th+edition+pdf PDF link annotation
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52164606411.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/zadobesebezesitifujezaj.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/78014844190.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/tuwixepelijodida.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/mesukijapevupomaxo.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090716232773499.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/79810261883.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/mibamadu.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/wenetegukinimogeni.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/8235734908.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/36413441297.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/xijebuteluredixobifeb.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139851cd6e6c---moridul.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/21165101004.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/notufamunag.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/45506427398.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/rijamadikatikivilim.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/59355152909.pdfIn PDF document text
    • http://kesifveotesi.com/files/76072726352.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/55606094980.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/buvatufikojufe.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/pajulej.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/51721784562.pdfIn PDF document text
    • http://medi-sen.com/files/files/8789973340.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/tokubivaz.pdfIn PDF document text
    • https://ms01bet.com/contents/files/vojugajifobotej.pdfIn PDF document text
    • 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_off0000bcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAE 17012 bytes
SHA-256: d8dd26650ea5cd975bbc9e7a50f9ab63fe261bdf2fccdfd89a1f0305bb6d70fc
font_01_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 11136 bytes
SHA-256: 45d2c7fb34d22e426cc978700346f69361fe12256edd0d98c5de46af1b359ca8