Malicious PDF — malware analysis report

Static analysis result for SHA-256 d051e67d1d8c13d0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 11:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0acb0abc9abe3be366c1f8a799547bfa SHA-1: 4edb8f55734c23187ecf10373ac5462c1f804646 SHA-256: d051e67d1d8c13d08e9be07ae3c4aca49e4f0d95812f06deff23096e6c10790a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=words+beginning+with+long+o+sound PDF link annotation
    • http://pastadimatteo.com/ckfinder/userfiles/files/85938778303.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/zanarusopepapekasidifivux.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/nisaxelixodetovawita.pdfIn PDF document text
    • http://www.andreapondika.cz/file/nalepolorijado.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/96889833115.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/57003107915.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/lobanuragozepebowek.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/sudanelewiza.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/likeludominesenobigabuwe.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/36906a3b7b214f6a5ee30b673d69d718/kugudew.pdfIn PDF document text
    • https://onlinendttraining.com/files/rinumobaxixadosebimo.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/62527985411.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/dawisezodujubur.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/subidemakajovu.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/76601615311.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9049cf7a---nijoso.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/37324923496.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/buzeriganoda.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/puloxodepetavuxusonixa.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109110230369711.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/12264638394.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/turar.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/78492777201.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_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 10684 bytes
SHA-256: aa5d8c960600d7ee8d8e0f10661fc55141774dc468925244bd83ae748d41a978
font_02_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 18592 bytes
SHA-256: 665a9afe93fee5d3c2e6c656b3c72fa728c06fd3baa2d1d516f3dcdc53c095ce

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