Malicious PDF — malware analysis report

Static analysis result for SHA-256 a667d2ea376ea9ac…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 21:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a3fd068d45512ebd3cf963790d56bd8 SHA-1: 29dc93814d0dbe46b166e00d86b9a3795e61507b SHA-256: a667d2ea376ea9ace6e64ae1fda39a272d3af762f6c13ed0e71b071fa276247b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://avision-italia.com/userfiles/files/29099589727.pdf In PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/fenixojodolodut.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130f9c4aabf0---93110309309.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/88691239270.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/24927602530.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/67597665469.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/79131563799.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/kesogisawikewor.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/kajad.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/89914843312.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/bobabugaxaloje.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/borarefojanikobemorebewek.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/43910156325.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/nomapigotofikalibapefex.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/10958974589.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/jarabiwatujevafuw.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/2192331341.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-7/20210907191407487531.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210907201052836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=procedure+for+yoghurt+production+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_off0000cba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA4 17260 bytes
SHA-256: 61c7fae8fa9da4edd1c5bba4680091f709c81f4e58b8d14453c5ddb272cc9bae
font_01_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 10736 bytes
SHA-256: 267630e17554bf846c6556125db8082bdfc26ce57cff426093c6c51a4eb5d589
font_02_sfnt_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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