Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00a72ad9220524f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 11:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b1b2eea700bf2bec160598eed7a1fd4 SHA-1: 8b06fc115d8b11dcdd4c090098b0ef4c7f45eebb SHA-256: e00a72ad9220524f5ff9008698143930fac485b6a62130f4bbf64334ddf844f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics suggest this document is part of a phishing campaign, likely using embedded links to deliver a secondary payload or redirect to a credential harvesting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=send+gifs+through+text+android PDF link annotation
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/95123112261.pdfIn PDF document text
    • https://music-group-store.com/upload/files/juboxamoxenumogudobowuf.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc04088321---jojiximufodufakomugubi.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/65037992531.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/tetumapewafoweresiravogup.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/gajodudatararopibugisumo.pdfIn PDF document text
    • http://www.moyekolodin.com/files/bijamukavegelunuziwa.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/53284330292.pdfIn PDF document text
    • http://lulanjina.net/upload/files/zomojideg.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/gevaromizegitiwuvob.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/wegurirofusesaketa.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/funatosutefibakodum.pdfIn PDF document text
    • https://projetovm.com/uploads/files/dinije.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/34261121472.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109152323002523.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/3804299660.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/81854703253.pdfIn PDF document text
    • https://olterus.net/contents/files/99434008196.pdfIn PDF document text
    • https://conrays.ru/f/data/91097562908.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/mefurejimamanozukefuzizo.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/lifezemunoko.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/xikepibejaxeli.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/45828432011.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/piboz.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_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 17632 bytes
SHA-256: a65a0c23ea2bde7bad2d8b694a640acb39ee0f1f677638129064af361cd7fbe1
font_01_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 10864 bytes
SHA-256: 49175a70e51f96bb9f124d9db5ee745728e7e59420c471bf7d88908c75f38959
font_02_sfnt_off000120e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1