Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c73d0397f90aac…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 02:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6fe051b37efd17c6fadbe9a64ad65a00 SHA-1: 4b2d5d45ee4a14cd6a2f02c86cbe50066d975509 SHA-256: a3c73d0397f90aac5bc420b8132366f9317b077d138c45ab1141a48f83255880
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=get+apk+from+android+phone PDF link annotation
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16149067eb1d41---7445270304.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4003c914c53bee9b62a61cc94f0ea4cd/tuzogozolopedopu.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/bujuso.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/57ab00d90725ecf3da800544555986df/35399130216.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/74368949942.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/4370030828.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/38659970276.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/15371643437.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/mokekufigupivez.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/josalabuzur.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/gojotuz.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/44270944682.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/koravupabuwemubavobewugo.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/wodezu.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/xexuluvoloxelejobexet.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/34036954046.pdfIn PDF document text
    • http://someteme.com/archivos/_20210901095312.pdfIn PDF document text
    • http://unsersohn.ch/images/file/28226107344.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/jijuxomin.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/wutosixu.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/20608186032.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/60318666445.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/togagurukiwata.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/zijugazakomivudebumelila.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_off0000b205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB205 10680 bytes
SHA-256: 47809ed4417e5dcfdc41d40ffdb8b8c8f8424615c8d26c384fa6d77121bdb30c
font_01_sfnt_off0000ca4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4D 14524 bytes
SHA-256: 1d9b323e6fb96245063a0c8c8849bb9596ab1375cacb9918b65a80e9c72f5d25
font_02_sfnt_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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