Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d74c813f069ca5…

MALICIOUS

PDF

69.7 KB Created: 2021-09-09 17:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60bbf13ea96094c1064260934900261a SHA-1: 734bfa3a99806aef7d702614e33b6db966aa2853 SHA-256: 67d74c813f069ca5c7aaa9b1f0d4123ea35118c2f37be0cf2163518fffe73197
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm. Heuristics indicate this PDF is likely a phishing or malware distribution vehicle. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting PDF vulnerabilities to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://2990592.ru/ckfinder/userfiles/files/zorurodelexupiwidelawux.pdf In PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/kanokiluz.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/27544773036.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/46215936415.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/58192095115.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/nefevokopevogupezudul.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/bibemedufo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dbce9fd0e---5658915151.pdfIn PDF document text
    • http://secoinblock.com/upload/files/gamukitekuno.pdfIn PDF document text
    • https://mediaskills.rs/files/30767909911.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/53382816474.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630619937.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/29234786257.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/mapevodarimiwabitu.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/megedanunasuxowubaroz.pdfIn PDF document text
    • https://egf.tw/test2/images/file/47885652546.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tuxatujeboboxaturogunid.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/28147836172.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/ketesaselo.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/wajufukizugorinunole.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/34952241271.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/33407381126.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202197617406594.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2cf8bd891---41140427349.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/99887260943.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/3390833508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=african+queen+jungle+cruisePDF 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_off0000b38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9D 14924 bytes
SHA-256: a0238d6b1eb78457ef5273cd47afa7c0cff6135eb8185166c177527abd9b748b
font_02_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 10652 bytes
SHA-256: 2e71391ee77bdb6bfb02c071057371229268287d624f546bcb256fc969d4afc8