Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5aec7df06dab05b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 00:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05228dfd2f7540a3ba20923f037cfbbc SHA-1: b01b0c1af5889d443557cf7463bcc98a9f11b638 SHA-256: e5aec7df06dab05bf21d208de8ba78f2ef8548f36f5826403cac5d03f71b41b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many pointing to PDF files on various domains, suggest a link farm or redirection mechanism likely used for phishing or distributing further malware. The sample's primary function appears to be redirecting users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rebeccaosborne.com/uploads/rubef.pdf
    • http://hoangminhceramics.com/app/webroot/uploads/files/guxifidodinovonun.pdf
    • https://24emk.ru/ckfinder/userfiles/files/27267481876.pdf
    • http://zhhyhb.com/uploadfiles/files/46822991956.pdf
    • http://fcraregistration.com/UploadedData/file/mikazizasetat.pdf
    • http://denda.co.kr/ckfinder/userfiles/files/tegamesaxe.pdf
    • http://tehpromyar.ru/media/file/nufulusikugipudotisu.pdf
    • http://doudou.tw/userfiles/files/16836057271.pdf
    • http://hoteldanang.com/uploads/images/files/kafulomogez.pdf
    • https://ikuseikyokai.jp/ckmedia/files/60052613256.pdf
    • http://sisparts.pl/zdjecia/fck/file/karidakamoxaxawe.pdf
    • https://sharks-cz.cz/images/file/84806222760.pdf
    • http://bukharaatlanta.com/sites/default/files/file/97241519176.pdf
    • http://tinavaron.com/ckfinder/userfiles/files/bifawulobodarubujoma.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/visipozosasurezazunoz.pdf
    • https://daaeportrett.no/upload/file/vokuzanejaroxapimiza.pdf
    • http://turinhotelcompany.com/userfiles/files/67441599172.pdf
    • https://megacook.pt/site/upload/file/48755143797.pdf
    • http://cosyromania.com/media/file/gaxinod.pdf
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/wuzefuzivadorapamipizile.pdf
    • http://scbczy.cn/up_files/file/20210907_055648.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210912_CFD2FFB6170F61A5.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161384250697be---36564305594.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+legend+of+zelda+twilight+princess+hd+cemu
    • 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_off0000b0ee.bin
99c8367a6073ea09f4b56721def96ce13419aae5529807b4a14c3754542a82ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EE 11276 bytes
font_01_sfnt_off0000cb21.bin
fd35fe4320cb5a3fe5d8d2b13abe0a0c1118a119360c25668ebbe998f9897025		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB21 18536 bytes
font_02_sfnt_off0000fb5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 16792 bytes

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