Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b24a932cee75c50…

MALICIOUS

PDF

89.1 KB Created: 2021-10-08 02:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9157fb483d0bcce3287896e60df9b85e SHA-1: 6a59e40f7c2e5151b56af7f22c25708d05bd8d60 SHA-256: 3b24a932cee75c502c11e723fbfbcdc80269d5294651c6a6a0e12b1668c7e61b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=feels+good+but+i+know+you+want+to+cry+out+lyrics PDF link annotation
    • https://sagarexpress.com/userfiles/file/zafetalomip.pdfIn PDF document text
    • http://yejida.com/userfiles/file/97975837029.pdfIn PDF document text
    • https://autoskola-scp.com/files/77631513246.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/19165258459.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/kepewanoxer.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/13968277840.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/26750400841.pdfIn PDF document text
    • https://limsurempat.com/contents/files/28058562890.pdfIn PDF document text
    • http://idcla.net/upload/files/77652319463.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/kasinugovebelavede.pdfIn PDF document text
    • http://maaramachandifpo.com/admin/userfiles/file/98308440571.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d228111a70e9d423438633f8a51bca05/18328772430.pdfIn PDF document text
    • https://davnosti.ru/upload/godenotufokujugikageki.pdfIn PDF document text
    • https://webhosting4.net/media/file/27180174253.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/faworifujuzixumifuf.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/17603023865.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/soposiliw.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/68473487134.pdfIn PDF document text
    • http://sentai.cc/data/file/20210908_022941_792.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/bevadorobaja.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/93278260271.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/ganedojov.pdfIn PDF document text
    • http://gardatrans.com/content/Files/wazunu.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_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 11056 bytes
SHA-256: 2f1b60bcb8a29aea1cef04b00c4413ea91b8c9eaf130ad789e01a1f0eee497cc
font_01_sfnt_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 19604 bytes
SHA-256: 7c5cf1f1a1f6f60eae80768c050f1f3acabbef6ed07e1e530853269ae4a97774
font_02_sfnt_off00013e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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