Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cf3093fc589c72…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 12:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b3f5f91f62f7181fba31aadd006c283 SHA-1: 72739d1b872d95e2cb48012cea5ed57d57796673 SHA-256: 24cf3093fc589c72b04a143404263e69dc3a5378c57887bcb9bf9bc3e0dfe701
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which are on disposable or suspicious domains, indicating a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm on disposable hosting, suggesting the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=the+courage+to+be+disliked+pdf PDF link annotation
    • http://rulada.by/upload/editor/files/zunem.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/56296045044.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/55906522229.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/21013917867.pdfIn PDF document text
    • http://ausafe.net/images/art/files/wojibodojedapotu.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/40734399337.pdfIn PDF document text
    • https://cooperspick.com/files/76224447130.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/35212804630.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/30245961094.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/28232470462.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/fisobowivibozapabivoja.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/58945153274.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/tagugevipuwij.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/17919800573.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/jakod.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/jaganelise.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/topivavuren.pdfIn PDF document text
    • http://alcantara.cz/data/file/80715571646.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320066bfcec---99869478283.pdfIn PDF document text
    • http://exosushi.com/uploads/files/11986515793.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/65420695683.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/s87g89b9im6serof9r9tjk9his/vurukanevekemor.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/824464053.pdfIn PDF document text
    • http://iknow.pl/files/file/37623110125.pdfIn PDF document text
    • https://yuktogel.com/contents/files/japifaxirawoj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 11092 bytes
SHA-256: 1a021bf19898883f9a8f270dddc907b3e13cc3d546f23a3d56770cb9f40f24b4
font_01_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 17608 bytes
SHA-256: a458a08819d9ca29e0c50a8eb256d82a0153d83e178b06ad88ff40234ac4c9e7
font_02_sfnt_off00012a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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