Malicious PDF — malware analysis report

Static analysis result for SHA-256 039fd22acce06715…

MALICIOUS

PDF

78.8 KB Created: 2021-09-12 23:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 321acc4801ecb55b78de9a25d6fa5cc6 SHA-1: b9747e90b03c2f0cb012213d255f2ec719cf87e2 SHA-256: 039fd22acce0671503f168965be6ae6568cea6a163e3e9b20bd482952f178f8f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/35028312011.pdf
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/47159989954.pdf
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/60358823723.pdf
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/winilox.pdf
    • http://cokhitienvuong.com/uploads/files/tuzetezafikavetid.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/99556868843.pdf
    • https://visualarchive.bg/files/fajerulefos.pdf
    • https://leresto-niort.fr/images/userfiles/files/63274236165.pdf
    • http://meuble-tunisie.com/userfiles/file/40217730472.pdf
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/36217738804.pdf
    • http://naoshima-habitant.com/images/blog/file/29707534905.pdf
    • http://pop-around.com/file_media/file_image/file/73095330264.pdf
    • http://hamyarsanatco.com/ckfinder/userfiles/files/8793220888.pdf
    • https://mercerapparelss.com/userfiles/files/solelixetekexop.pdf
    • https://balticstroy.com/uploads/files/69441203642.pdf
    • http://abcbyspu.net/ckfinder/images_store/files/zugeremozanowuwelepu.pdf
    • https://fishboat.hr/files/26364921497.pdf
    • http://star-transform-moscow.ru/uimg/files/popujisegarololabu.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/31750850155.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b180a74e17---sajilazapajovozokomunix.pdf
    • http://masterkontroll.hu/ckfinder/userfiles/files/bazikaginusakanufizedig.pdf
    • http://eros-arena.com/eros/userfiles/file/71680622120.pdf
    • http://gr-chem.com/upload/files/pukajuzumadivi.pdf
    • http://es-manzokudou.com/yamituki-n/uploads/files/4277797991.pdf
    • http://chiangmai-esc.net/user_img/files/zuliwumovunewotilunux.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chemistry+textbook+form+5+pdf+kssm
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd1f.bin
9dd65d44172f3f13c8e7643ca993067c82922e11c1f75226e07eb238e2a97de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1F 11064 bytes
font_01_sfnt_off0000e6c2.bin
6119baccf5211af88862c232ea71ae735af58c8dc16af40e7381ad6159a85ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 17884 bytes
font_02_sfnt_off00011577.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 16792 bytes

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