Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab7efe0b6dbc81a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 05:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 760e4ad2e3f5b3e93e5f43689855c529 SHA-1: 7c961d3041622590801661abcfc22fc210b6c541 SHA-256: 3ab7efe0b6dbc81a8f8d036d59a4511544d809146eefbe96d643d969528cf2fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to other PDF files, suggesting a multi-stage redirection or download mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://go-pxl.com/uploads/files/81130283886.pdf In PDF document text
    • http://clarksville.net/wysiwygfiles/file/61503203998.pdfIn PDF document text
    • http://jaatkinson.com/userimages/63340731595.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/dewubobuwulutudetigevij.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/vibuxagom.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/16195635297.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/rixepuzav.pdfIn PDF document text
    • http://stevis.cz/files/file/14463814784.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/93215887473.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/musipewuxuxovekowu.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/45440542652.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/69958736364.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8bfd9ba7c---20633629169.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/nupenokekobuvebovotaseno.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/zakoburubefabib.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631441666.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/37489134166.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/wujeram.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/novemamijikibor.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/17455782462.pdfIn PDF document text
    • http://rideco.hu/upload/file/domavapanebofatu.pdfIn PDF document text
    • http://m2m2design.com/userfiles/3299559100.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907232807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=where+can+i+watch+a+silent+voicePDF 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_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 17148 bytes
SHA-256: b12184778d5d213db2bf7d84c18926a783b3e87a45f5bc5338c40fd0e73b1841
font_02_sfnt_off00011b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B20 10472 bytes
SHA-256: efde431826c6d41522e3ed332a9a8902dca73a8b93bf8c16023ba376fc73d157

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