Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb6fe205bd43716…

MALICIOUS

PDF

71.9 KB Created: 2021-09-10 09:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a20710a716cab9c40d4e10b7501690fc SHA-1: 86ecaf249d28977a48ea0c01f69535b976dd959e SHA-256: dfb6fe205bd437167f7b03f4aa39988fdd2e7d74e23749b6577ef88f75d857c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://krisoc.ru/uplcv?utm_term=bajirao+mastani+full+movie PDF link annotation
    • http://mictrogiang.com/userfiles/files/wimoxenopusapetetodefesef.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/romesi.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/laromud.pdfIn PDF document text
    • http://fkhd.cz/data/img/54022019976.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe33963a6---zeximokanoge.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/93771712251.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb34888d1e---jarekujapod.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/rikuzuxidonezutelago.pdfIn PDF document text
    • http://www.og2c.com/images/file/tukugasarikogoxedupazib.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/muvefoware.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae369a2402---66162524565.pdfIn PDF document text
    • http://gzwep.com/img/file/20219195356.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/vepubosulajawijeluvo.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/9115115904.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/kowikijevuraliwadamoz.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/55071195260.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/42882934778.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/ruzorevev.pdfIn PDF document text
    • http://abwrva.com/uploads/files/88886570832.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/fowifosoragisoneg.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/99269933988.pdfIn PDF document text
    • http://ucokampen.com/media/files/54051329963.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/54359531211.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/95894945524.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/76343688206.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/kipilebiviwobejaw.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_off0000b764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB764 10724 bytes
SHA-256: 2a50caf47534025f2bd10a1b8930e8ded0e9f85f2c364fc2311897b47bc8779d
font_01_sfnt_off0000d003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD003 16176 bytes
SHA-256: 84ab577c127336208c76ae2d162775ef7e4e3ab2673395c5d08f0190fe920101
font_02_sfnt_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1