Malicious PDF — malware analysis report

Static analysis result for SHA-256 0527b0fd4fde5633…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 02:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8b807057d43dd8966f6601873448141 SHA-1: 3b6d4140f21575c1b9b053225eaaf0f171fc1d2e SHA-256: 0527b0fd4fde56336ce66648122910bca2512ae7ea982059a396493a67b5e88d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, suggesting it functions as a link farm or a distribution point for further malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://questyme.com/userfiles/file/26470575108.pdf In PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/fuvokiduzeziferanu.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/26846495992.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021910021374564.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614098fe1258c---duzuxakabirijiwul.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/wotebawipirufabotitoruk.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/21431291123.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/37672189557.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/63510540609.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_05_06_38_40_2802.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/93136308308.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/xonemifejezatikiwuzitila.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/falisusozililogozegif.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/misenozigotujujogux.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/49370714961.pdfIn PDF document text
    • https://bunianco.com/other_files/File/gakidexurirejivo.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/muruwuwomanegane.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109091107042233.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efad203f64---lemabenit.pdfIn PDF document text
    • http://gibisch.biz/files/files/tovesafepibuja.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210908051940.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/92277854148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=religious+and+cultural+values+in+indiaPDF 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_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 10756 bytes
SHA-256: a72d17dcef184b91ae760a372136f5355f65be3bd991ac3a673ab5806785a8f5
font_01_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001154a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154A 17332 bytes
SHA-256: d3d958589dc122401b2619ab190b70b52c02e37130f4c5bb2ca92c3cdaf75ef9

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