Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bb3d813d4e9882…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 02:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7f80a39461c87eda453664e03b13627 SHA-1: 4a9447dd45e062d3bc831fd818e1316f7f5990f0 SHA-256: 16bb3d813d4e9882e5334a882da4cc21c4daaeed3abd463c50d28b0ff3858414
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://namadagaskare.ru/ckfinder/userfiles/files/momifomovigedukusabute.pdf In PDF document text
    • http://mmsmarin.com/imgimage/file/vufuvenezizotise.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/valesefebosutuve.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/jamez.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067cbbf610---rogonegusima.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/51449456748.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/80114498738.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/42525082322.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/98554185352.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/42993904574.pdfIn PDF document text
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/puzarezazoduvip.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/fufovu.pdfIn PDF document text
    • https://mattress-leader.com/media/juvaworajuwinufivisowofa.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613432cef20a0---99237685611.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/diropesux.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/tudalerusimew.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/fatimegukedovonexowaras.pdfIn PDF document text
    • http://tabletopad.com/images/file/kisikezarifivibugafas.pdfIn PDF document text
    • http://kag.fr/userfiles/file/25927899206.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/4938097479.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/pedijizidokado.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/muful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=above+suspicion+streaming+vfPDF 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_off0000b8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E1 16872 bytes
SHA-256: b3501e3b6d54b40ef15a764bb8c13440294dd1b0eb20f83fac6366687a1b4793
font_01_sfnt_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 11064 bytes
SHA-256: e74c3f830585a33398c7086f543c8d8882cc94bb2856c8b5ad1b9e02e7535c75
font_02_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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