Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fecb51548bbbef5…

MALICIOUS

PDF

70.3 KB Created: 2021-10-02 12:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa693937d5daddadcd4859975e0f4236 SHA-1: c84f364c308f7f611015964a0998d02822cfeeef SHA-256: 1fecb51548bbbef5bda3e73e7b1acbaa54f83f18ee2a9db016d38bc7155f3f25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to malicious external sites, which is a common technique for phishing or distributing further malware. The presence of many URLs suggests an attempt to obscure the final malicious destination or to spread the malicious content across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=funny+little+quotes
    • http://2safe4u.cz/UserFiles/File/rudumagipejepugusopu.pdf
    • https://dolphinsolutions.net/ckfinder/userfiles/files/womedeguvefi.pdf
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/53033780203.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7bf3b298a283b8f2b396f462ad5f1bcb/42049755526.pdf
    • https://inprovitcolombia.com/ckfinder/userfiles/files/verukakifudubikam.pdf
    • http://rideabikenews.com/user_img/files/89144699852.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e1ee52e9091f675f469850d21adbf823/35735723539.pdf
    • https://rockeit.com/userfiles/file/51496603703.pdf
    • http://tw-jia.com/uploads/files/202109120015029843.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/33287324228.pdf
    • http://onnetsolution.in/userfiles/file/sabulezumuxevizevabovup.pdf
    • https://clove7.com/userfiles/file/buvegupesojig.pdf
    • http://www.ecostroyservis.ru/File/21095864110.pdf
    • http://homokkepek.hu/editor_up/vamivezevafarepotesu.pdf
    • https://tigaintan.com/contents/files/fewevenu.pdf
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/39835238107.pdf
    • https://edinburghpools.com/contents/files/gawarumifidodureda.pdf
    • http://rfinshaat.az/userfiles/file/wuduxifuwajusanew.pdf
    • http://ndt-ultratech.com/files/64368541129.pdf
    • http://wami.cc/data/files/rewedugowuveboxipemid.pdf
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/25753886356.pdf
    • http://goldstecq.com/userfiles/file/pivaxininedinuzaka.pdf
    • http://weddingdove.tw/uploads/files/202109261128197676.pdf
    • http://gymostrov.eu/gymostrov/userfiles/file/fatora.pdf
    • http://abovomedia.hu/_user/file/tumuvizojulomimixal.pdf
    • 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_off0000b349.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB349 16792 bytes
font_01_sfnt_off0000cb60.bin
ec89ed22f11def06e23b2a1d707b66a7e2eeef22a0533231d4a0ba2bef56097a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 10176 bytes
font_02_sfnt_off0000e24b.bin
14e55a734f72135c9024388ce54ff6e81143606865c8eceec5117ed1451e8a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 16196 bytes

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