Malicious PDF — malware analysis report

Static analysis result for SHA-256 4672a775cb277f62…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 20:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04869f7b51f5a17608148b8935443853 SHA-1: 1dde13df7d9ec3cd2078874a3c720b9b17489f46 SHA-256: 4672a775cb277f62437d7e949b72dc869eb91613209ef5ec0c81cdbe1f93a2b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://grandp.ru/userfiles/file/36185987222.pdf In PDF document text
    • http://ventss.ru/userfiles/files/99720828659.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/45416538726.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/dadoz.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/rokiperoterunivelo.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/pepuzezebeveku.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/levuvimo.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/60158624960.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/vatobigajanun.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/89095481646.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/pamuporuxizule.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/zakepezuvatinekan.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d259b0afe4772748e4757860c1e3783e/baxol.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/wegexomidedegi.pdfIn PDF document text
    • https://gornjastubica.hr/files/vogitalawamajomevo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f98af817f7---lojijipi.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/wurudutesujipasazupi.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/bozat.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210916024811.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/sigumosenosuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=justice+league+a+better+world+watch+onlinePDF 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_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 10964 bytes
SHA-256: dab21f575da17ac9fdfe5746887d10398382f7db828bb2725e59e292fabe7723
font_01_sfnt_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 18992 bytes
SHA-256: ef11a2da25b67e626c21521ef54053f857bb1c6b16531a9d1b944e2e69d3bd86
font_02_sfnt_off000123c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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