Malicious PDF — malware analysis report

Static analysis result for SHA-256 2192614ba1c904cd…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 08:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50a2d145c93af9b04b2b1851f749da7e SHA-1: d704b51ba834f70dc8d3f950b1e0c7a8fd11e3c3 SHA-256: 2192614ba1c904cde92ab86c4446b30a42a1f18a763c617479187ff204f57e2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, likely intended to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=dua+for+weight+loss+in+arabic
    • http://tincorner.vn/uploads/files/77140710951.pdf
    • https://pottoka.info/files/galeria/files/fivamulezaxum.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16310844390084.pdf
    • http://stellarp.com/userfiles/files/dekudupedi.pdf
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62300156885.pdf
    • http://www.mousumibanerjee.com/fckimages/file/xusiduwibixoxidido.pdf
    • https://cargoservice.pl/cargoservice/userfiles/file/gevamixokekenawelogiwowo.pdf
    • https://hahapediatric.com/uploads/files/202109071558025261.pdf
    • http://rts-3.ru/upload/files/6684554934.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16139965ac17e9---86085480969.pdf
    • http://watthaistuttgart.de/userfiles/file/14365377663.pdf
    • http://csc010.com/userfiles/file/20210917145021_x9pgfu.pdf
    • http://autosoftware.company/autoresponders_images/files/77958588554.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358859a64a0---19551747006.pdf
    • http://feldbach-tourismus.at/files/movivimuwur.pdf
    • https://ebooksweb.net/files/file/67033321180.pdf
    • https://atavio.ru/files/file/tirajal.pdf
    • https://nulifeus.com/~nulife/userfiles/file/begudemexokojukabe.pdf
    • https://anaksemut.com/contents/files/53689568317.pdf
    • http://weiddy.com/uploads/files/202109100432346012.pdf
    • http://cbestdesign.com/ckfinder/images_store/files/76402510109.pdf
    • http://a2hgghk.handylover.com/upload/files/rawibosojefuronulotun.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_off0000cc43.bin
8b56dc0244c18e7a17f06ed2125bd6bad7618453c5ed13580c1a54230aeb22d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC43 10940 bytes
font_01_sfnt_off0000e5a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 16792 bytes
font_02_sfnt_off0000fdb7.bin
30cfd8229d60840d40b555504f4b08a950de4e83de6af737f474fb9456a41f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 17576 bytes

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