Malicious PDF — malware analysis report

Static analysis result for SHA-256 92210aab92aa6a7d…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 22:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98ce379e312fbaf05d690c70ae4f4e13 SHA-1: ef5c8f0cc0da2cf009896278b3df13534ef5bfb4 SHA-256: 92210aab92aa6a7d48886d249b3a3a616da1662c1c7a8ef9f73243ac3d892861
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, including one identified as a link farm on disposable hosting, suggests the PDF is designed to exploit vulnerabilities or trick users into downloading further malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://speed-r.com/js/upload/files/poxiboxenefod.pdf In PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/78824060653.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/94357704521.pdfIn PDF document text
    • https://vientangluc.com/upload/files/6629424418.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613689945866b---83241419780.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/48407405950.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613260dbc682b---vuvefol.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/gimomirotovowix.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/gobuxipa.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/wegozibibolebiliwa.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/25270219565.pdfIn PDF document text
    • http://info56.ru/userfiles/file/41447225460.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/zawasora.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/wumufuxivokowexe.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/78205935346.pdfIn PDF document text
    • http://sro52.ru/uploads/files/zelafezubilon.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/lafalajaditowipugapila.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/11575756440.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/zedojusuxifuv.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bvbka9h9f0hkus0sc9oeg8asn6/74595503713.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/wovikisebasu.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/vejotudadutukonawoxaxo.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/44840323736.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61241875014.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/lugedoxetubele.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/gokomiputumugamuxokenos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mi+theme+manager+apkPDF 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_off0000c850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC850 17428 bytes
SHA-256: a20cf1d574468d1b08a49a25a541427e67cbcd948778f85502ec4c66d285d2d1
font_01_sfnt_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 10452 bytes
SHA-256: 4e29a401b24437f2ed610e97d524246aac0eedc38f0e86fad0cf8b17040be32a
font_02_sfnt_off00010cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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