Malicious PDF — malware analysis report

Static analysis result for SHA-256 17dbc45a88eb83ea…

MALICIOUS

PDF

66.8 KB Created: 2021-10-02 11:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ad6ab504e78bd2193c29fb4a0ebbf54c SHA-1: c5b8fa260752587aeac501bae931640dae1c6654 SHA-256: 17dbc45a88eb83ead21dc35050ad3048731f2d200eac86612c4a4f9bb3f47479
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it is designed to redirect users to potentially harmful websites, likely for phishing or scam purposes. The PDF structure and embedded links are indicative of a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=goals+of+counselling+psychology PDF link annotation
    • https://subarini.ro/mm/file/fupasalefudidimepuxupuja.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/lopawabulegapolom.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/vebowijilumetekaxubilitu.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/xamemadomujurusapa.pdfIn PDF document text
    • https://denimder.org/resimler/files/23997986884.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/84388387984.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/rodewatokulirukizopeta.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/87648323204.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/61633853087.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/nudetevoterituf.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/pumiwegudesup.pdfIn PDF document text
    • https://superpart.com/files/xutojedikitixogaxila.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/75734964443.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/gunijevogefiraj.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_off0000a466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000bc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7D 10812 bytes
SHA-256: b0d69e472fd2a17236538d76ae13e03865edb8adc7afc5dfe53427edece8c2e5
font_02_sfnt_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 16308 bytes
SHA-256: 4821c07fe5650fd24de19d4efe6e6731534b6b495a49b25c27e43bb9150a2db0

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