Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23f768b76c60dc1…

MALICIOUS

PDF

76.3 KB Created: 2021-09-30 12:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d4b0399e7ad83f2dde78b0e647da78c8 SHA-1: 4da87a9d7e9901ae4c5e57e257fbc567722d97db SHA-256: b23f768b76c60dc163531353cf89e27b1c3e889a6c0e488406414329473f5336
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely intended to lead users to download malicious payloads or visit further compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://pixomot.ru/uplcv?utm_term=download+premium+adfree+apk PDF link annotation
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/korenizisodovukanavizuv.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/71151203182.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/22253850457.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/41559299358.pdfIn PDF document text
    • http://101balkon.ru/upload/files/fegujemetumoruvurotig.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/77690606784.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210926084742_209110173.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/95955485886.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f81a7c59da---75682463344.pdfIn PDF document text
    • http://lagrupacio.cat/file/penofarivax.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/16857124295.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/73737433840.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/badefesutexipur.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/68072311489.pdfIn PDF document text
    • https://rm-parketi.si/uploads/38721417745.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/moveso.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/gefuwusibadikitetazu.pdfIn PDF document text
    • https://sscs-uae.com/userfiles/files/76855399989.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/79240039901.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/90520637409.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/jononoveritugemefad.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/kedire.pdfIn PDF document text
    • http://theponghop.com/upload/files/96884852902.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/96876707851.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_off0000bd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD25 20516 bytes
SHA-256: ff58d86c47201eb8911fcc5153a078a374bc7abcd7ecb5e9e54f7e2a69d22a0b
font_01_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 10672 bytes
SHA-256: 68564d99b662f3e41a5c49e8e1fa23aff1d4c8803857a26e9577c580a8ec588c
font_02_sfnt_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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