Malicious PDF — malware analysis report

Static analysis result for SHA-256 2614702db0fff23f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 09:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a28a3cf401c0e8092a649c2da547ad5 SHA-1: 1739f9277b988ba74215b604fdcd9037f540c25a SHA-256: 2614702db0fff23fa7171d9ba9ea7b17cadef6a2f0897cd626007c97fd91f32a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The embedded JavaScript likely facilitates the redirection or delivery of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://bengalroys.com/ckfinder/userfiles/files/93287628001.pdf
    • http://cathugo-catamarans.de/res/wysiwyg/file/xudol.pdf
    • https://netiko.fr/img/Data/file/45509915363.pdf
    • http://poexali.org/static/image/_u/system/files/54631610933.pdf
    • http://szguilong.com/userfiles/files/nosijopedozezuma.pdf
    • http://women-for-marriage.com/ckfinder/userfiles/files/24236085354.pdf
    • http://nenayu.com/filespath/files/20210901154445.pdf
    • http://hwayinn.com/image/files/20210909_193810.pdf
    • http://stepasidemedical.com/images/uploads/file/nafumagovor.pdf
    • http://bannhuaduong.net/upload/files/kepijupuwenuju.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/zolisorafi.pdf
    • https://pacie.vn/web/uploads/files/lasulekijajopowika.pdf
    • https://riolospettacoli.it/filesUploads/file/sojagokukalonitamigori.pdf
    • http://beergolfers.com/blog/images/file/welasusagijopazawokezejab.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b9bc67bf---fubudaxur.pdf
    • http://leaguengn.com/userfiles/file///26556080856.pdf
    • https://civilkontroll.hu/uploads/file/nizitarix.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/37327465768.pdf
    • http://mibenjamin.com/userfiles/file/nekizebe.pdf
    • http://gazosilikatnn.ru/uploads/files/difijawesolo.pdf
    • http://likuidart.com/files/ckeditor/files/73186887833.pdf
    • http://pn-tech.net/userData/board/file/juwowowusapu.pdf
    • http://clubselectionvoyages.net/images/file/22253776832.pdf
    • http://vertex-decor.com/userfiles/file/potapegaparudisavagip.pdf
    • https://www.truck-transport.com/ckfinder/userfiles/files/kexanufobokabagotikagabak.pdf
    • http://ukkies.be/userfiles/file/bewobetevu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=convert+mp4+file+to+mp3+online+free
    • 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_off0000d906.bin
493bb4ce8fdaa105580502f87460a9e104958c5b9737330018e67098dcec6e6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 17108 bytes
font_01_sfnt_off0001050e.bin
474951042824ed0924ece1f3e35db3cb17e7df556dd24144328de5add1c97740		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 10536 bytes
font_02_sfnt_off00011d1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1D 16792 bytes

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