Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8326a421ff8c49…

MALICIOUS

PDF

67.7 KB Created: 2021-10-04 07:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0a56d00b043c242911931f1bda16d34e SHA-1: daef80aa1de6aa6139d5d9616c7d753ccb528c58 SHA-256: 9d8326a421ff8c49d6a6281f4696501e3c24ad8e17cbbca2865250c6b7169b82
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs suggest a phishing or content-scraping lure, directing users to potentially malicious external sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://orderleesushi.com/uploads/files/48964519078.pdf In PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/rejale.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/21857933647.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/wovozikolunezedilefer.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/wagubanajoraveno.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/71998322369.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/51614324835.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/kupazanepomo.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/78208316845.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/sadixukok.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/donafamigozakujeva.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/80991342857.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/gusoreledi.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/mapawaforobesoxup.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/7479025727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+i+remove+the+password+from+a+pdfPDF 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_off0000a8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A5 10756 bytes
SHA-256: dacb00e109d0ac296ee1e49a5371c5266299e79bda3840d767f5b825e10f3a08
font_01_sfnt_off0000c16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16B 15804 bytes
SHA-256: 4bf64214cabc34baa31365a14d738d100dfc0f4e51f5931de97aa15df81ddd62
font_02_sfnt_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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