Malicious PDF — malware analysis report

Static analysis result for SHA-256 f123dbb5c8909ea8…

MALICIOUS

PDF

72.5 KB Created: 2021-09-10 21:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d34fc5e68d3bcc1c92c1b97ca1934ccc SHA-1: da18b59f7a3a5f41583a30c89e1526d04c56b893 SHA-256: f123dbb5c8909ea8d2f74d17bfd88f919ce8407a22dbbbdd22b392781782b1ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous embedded URLs, many pointing to suspicious domains, supports the conclusion that this document is designed to redirect users to potentially harmful content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights the nature of the document as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://stellar.ru/ckfinder/userfiles/files/wilinono.pdf In PDF document text
    • http://gemcom.org/userfiles/file/75429338812.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/radawutixejube.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/juzodebipepoxolofejevidun.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fdcc4903f---37088460340.pdfIn PDF document text
    • https://clinicscrm.com/img/files/gotewemojipiw.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/74698258397.pdfIn PDF document text
    • https://matricula.arendic.cl/files/bixurinedosabo.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/pidifonub.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/35812125909.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/73578149167.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/87942296412.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/wuwirenopazidegog.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/kizotujamobuwa.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/gomapujetebuk.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/wafijovuzix.pdfIn PDF document text
    • https://funke.be/data/file/ridapapatililitifikax.pdfIn PDF document text
    • https://cowik.pl/upload/26699310100.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/minasisiditoxu.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/22657863834.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/76030178583.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/katepekawuku.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/m3l0vi44fcdnfqbppfio8ehk5v/76564303192.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/97141185129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=earn+to+die+1+hackedPDF 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_off0000bd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8C 10380 bytes
SHA-256: 63b95b54f0656becbe68bf0d4a86e91fdd6817be6dcfab992b772dda3618c12f
font_01_sfnt_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 15420 bytes
SHA-256: f0087898aeea2dc3ccf7fe4e64ceeb45a6062fccb50c860d3c2872816447991c
font_02_sfnt_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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