Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e7539d1bd64910…

MALICIOUS

PDF

83.3 KB Created: 2021-09-24 07:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e866c4d704f239f18df7564f1745102 SHA-1: ddfd7b2b9541e5b01cfbd11bc58b1f00ad152e4a SHA-256: 69e7539d1bd64910d95272e41b7d723a1d0d88bb135d84f766a54603a2474cd1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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=pdf+printer+windows+10 PDF link annotation
    • https://tessuno.com/upload/files/613fe9a98a941.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/97343424769.pdfIn PDF document text
    • https://yifff.se/userfiles/file/kuzotirekilibubufanoka.pdfIn PDF document text
    • http://saaretravel.ee/images/file/zuzojopobazexojofige.pdfIn PDF document text
    • https://rintrans.com/files/pofigojobasopubozelof.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/kopowu.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/ruzufotabubot.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/38655162825.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/19468500220.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/be96492d7b3e39d3bcdc2aff5d5830ba/95239325677.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/32502106943.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/56747935548.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/metozeb.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/93623933841.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/jamodatazalawerezoka.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/26398666525.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/jekemapejexazevufij.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/89049936484.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136be900b866---fezixo.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/lofaziteliwid.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/27450410067.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_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 17500 bytes
SHA-256: 672b1da79f8457dd431f7c88bb201a0f987b4a74f5cd87bbdb68ed891fab7735
font_01_sfnt_off00010ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12814 10544 bytes
SHA-256: c3a30cfd30d34af47372c9b1302ff2e524f8b2099fca9721eb4d099432d59402

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