Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c2f81acaf84403…

MALICIOUS

PDF

75.6 KB Created: 2021-09-28 12:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ee2b3e6e6f64109621d09a12e8a0a54 SHA-1: 96d27d4472234a18a4fbdd0ad94378c76f133783 SHA-256: 43c2f81acaf84403e46ead8f08ccf624559c9b38dcce309151dd1b2d5b1fe92b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving directing users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 5

  • 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.
  • 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://chcial.ru/uplcv?utm_term=tere+liye+selena+pdf
    • https://markyatirim.com/resimler/files/54667904704.pdf
    • https://kawanmto.org/contents/files/33721282764.pdf
    • http://antonellascarpittadesigner.it/userfiles/files/17124599070.pdf
    • http://geofer.eu/userfiles/files/gapopuridevejotepab.pdf
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/54099557329.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a14d830f2c36f7a801c6dac0490a0e88/fizeri.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/xinojibuja.pdf
    • https://santehsevast.ru/userfiles/files/towaguzozupawowevowe.pdf
    • https://maria-galland.ru/files/file/zavilimugofu.pdf
    • https://tonmathunglan.vn/upload/files/sonafatuwi.pdf
    • http://seksdagen.nl/userfiles/file/67250025248.pdf
    • http://dermatologomiguelgallego.com/miguel/fck/file/raxulademikokukezu.pdf
    • https://ww150003.linebot.net/upfile/files/20210910153418.pdf
    • http://copy-office.it/userfiles/file/82647472767.pdf
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/48769124020.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/rozomexawuxetawofawuna.pdf
    • https://www.hosotte.com/ckfinder/userfiles/files/xuguredixamudi.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdea02a00---30610918622.pdf
    • http://fxmeat.com/upload/file/00050bec087d1b73d46cfef58dd4084b.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/dosugetivonozapejevagu.pdf
    • http://ginzaramen.us/uploads/files/60526793041.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/potufutuvux.pdf
    • https://recapress.com/ckfinder/userfiles/files/ritijofuvaliravet.pdf
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38194609507.pdf
    • https://derya.afmiletisimajansi.info/resimler/files/weketubaviwalujem.pdf
    • https://kimansion.com/uploads/file/faxifelusowarelakeb.pdf
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/farajajupogexa.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_off0000c2f3.bin
4a66d3930274956a020987648346b904d4444867b6e2b219bf13b3f872ea9b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F3 10352 bytes
font_01_sfnt_off0000da64.bin
be7aef0115485ea7c7c51a0d53d5d49141ac71a94d809f8e12bbdcbd4948668a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 17956 bytes
font_02_sfnt_off000108a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 16792 bytes

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