Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4d8daef639f0bb…

MALICIOUS

PDF

76.7 KB Created: 2021-10-11 02:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f7076e8876186bf450b60f819904914a SHA-1: 22857150fb347194ca8887685d989284f6b4a5a3 SHA-256: ad4d8daef639f0bb9af741df7561dcb930c8c9efb5ff2e52254e075fd4851a94
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to mimic an invoice or payment request, a common phishing tactic. Although no scripts were explicitly extracted, the PDF structure and the high ML confidence score suggest malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://montex.pro/uploads/userfiles/file/27858974406.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161368cc99bbf2---zuzizavanapowogodezak.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/28288554116.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210918215946.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/wedaloxewexedujupekimu.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/26156634200.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/7981373544.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/48620123875.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109031254487256.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/minusuxuzikexamosufaw.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/54229371937.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/23964726809.pdfIn PDF document text
    • http://cwesp.biz/upload/file/36291735103.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/39863123759.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/vimolibumajujodagazi.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/50159185128.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/xoziga.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/42997221677.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161328b9f24302---powogesatotilafevibubolek.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/lilezakasu.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/46259885425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=authorization+letter+for+senior+citizen+buying+groceries+tagalogPDF 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_off0000c649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC649 17400 bytes
SHA-256: a85023d9ec74fdc2782b5296c7a82ba4421c077d75e0cc3544ed08f92a222e29
font_01_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B60 11012 bytes
SHA-256: cd0d5ed831727e164455aa57787ad7eac257226872c71c6ec5923d753110a4f4

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