Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c16619e545270b7…

MALICIOUS

PDF

93.7 KB Created: 2021-10-06 15:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 909b1dea965b510c89804bd694cd5a95 SHA-1: f2a69912d93abd1b63ae7816d2aa035bbbe86ca9 SHA-256: 4c16619e545270b79fa0c0b88b5d7e6621e49ee11bdcbbd21c18b0f47966538b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://archism.ru/uplcv?utm_term=the+marketing+mix+consists+of PDF link annotation
    • http://sharon-barron.com/userfiles/files/41287083894.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-24/20210924053726249408.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/27895867022.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161580da25d9ff---70852964427.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/65275587702.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/14740158265.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/0b4955924094e44ad9b7aba9200de152/zenimitizawen.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/62426098630.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/sareruzibimejaxan.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/52176459439.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/zanew.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/donoduge.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/muragonofobababiniruxi.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/dupezotabazazez.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/19456196600.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/46464461630.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/kubajakoneduwoxirodiz.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48874499426.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_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 10896 bytes
SHA-256: 7ff259a3d2e25ab299584c90b262480e7a6de1ad9871e6963f661e84f92dba40
font_02_sfnt_off00013853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 19020 bytes
SHA-256: 630a1666da82bcb375f371ec1d596993afd129b66d49d0352aa20f5ded8e52a8

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