Malicious PDF — malware analysis report

Static analysis result for SHA-256 884c7e9ac84bdbb4…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 22:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57e00379d4e69eeeda5a8aec9e640a6f SHA-1: 4e7e1ef50b705b602f0579784095b5f984b3005f SHA-256: 884c7e9ac84bdbb4f5e357475f0a2367dcb89ec9e2ef5b6d4fc0fe5e43e770e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple external URLs are embedded within the document, suggesting an attempt to redirect users to potentially harmful sites. The presence of numerous distinct hosts and UTM parameters in the URLs further supports the link farm classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://104408017.linker.tw/files/levomipevusejasoso.pdf In PDF document text
    • https://questyme.ca/userfiles/file/miluti.pdfIn PDF document text
    • https://ekransamara.ru/files/jenogemonipemikuzewoxara.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/23543806333.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/63420322510.pdfIn PDF document text
    • https://nada70.org/userfiles/file/vabegojinanovozugaregi.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/muzakogupejovademufadin.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/niviba.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/jotinoxoxidotugoti.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/luxeruxasoref.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/40098985072.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/58caabeedddd35e270fa0e187f3e9afc/niwawizema.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/wibakotajesaxuzeti.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/gumabitisina.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/88267451914.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/bixotugidevinowenavitad.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/50010891807.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c03f6b3bd0---86856865475.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/38421618594.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/19590209665.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/6902508305.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/58739743942.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/xobuwutuwebafisag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=jackie+mize+supernatural+childbirth+pdfPDF link annotation
    • 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_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 17640 bytes
SHA-256: e062b82e5f137a6f8ecc3f48b7814d325b3bcd2a0c6d7272ecb4b38e3d199461
font_01_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 11148 bytes
SHA-256: 4dca7dc998d39c6ab11408dfd9c354bb1e81f37eee2032262f2f1d545ee123b8
font_02_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1