Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b28cab52a5176e8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 19:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce4778cc95654ddfcab6c4c11945312a SHA-1: 0c1df9a9caff785bb1a147f8b041aa392b158df5 SHA-256: 2b28cab52a5176e82b87b54a7f4fb4f35dd19411d3e3ddb9248e7ab4abde6f46
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://steelfurniturecn.com/d/files/jiked.pdf In PDF document text
    • https://fiscconsulting.com/userfiles/file/75729395430.pdfIn PDF document text
    • http://expresskaliski.info/file/36215291067.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136831ec33af---popipawerozeti.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/46747232252.pdfIn PDF document text
    • http://mobilenmr.com/files/files/9437560033.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/siminimipoburuze.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/jibotubeposumumogan.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/78998806524.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c3c591ee5---vobit.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/tavilovigurosutibola.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/nuxuwar.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109082207336082.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/15524458780.pdfIn PDF document text
    • http://armanetti.com/images/66402173171.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/nobajaliroxujepegosukub.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/75088109123.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/43027498260.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/gitizevufiwinovosutewax.pdfIn PDF document text
    • https://mbbs.hr/files/tipesa.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-18-07-32-52-51.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/93016266871.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/bijadapuzanigizuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=modals+and+examplesPDF 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_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 10356 bytes
SHA-256: 3c85a7cc568bd0da9764fb291bca7d0296333c128e67a2bc90cb1dcd98ee90d4
font_01_sfnt_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 18420 bytes
SHA-256: 1432fcebbfe5cfaa0f8c33fc9475c82aba3ed12b7f51ac8ff7b2972c5355dcd1
font_02_sfnt_off00011961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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