Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5c3ed41d951e1a…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 17:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3d303f37dd659408581c9c948d350c45 SHA-1: ef182648f598a0ba2447afc23acf7ccf5394baa9 SHA-256: 7e5c3ed41d951e1ad057046ab0720b2dbfad66ec2833a1239913da4d1827a9e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF identified by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically noting a 'link farm on disposable hosting'. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=the+wall+street+jungle+richard+ney+pdf PDF link annotation
    • http://lgassociates.in/uploads/71253800824.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/51400427080.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6f19dc14b335ed44b3ea9f4eef2a0bc9/jazebatimuwakeriral.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/89886624608.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/8530726520.pdfIn PDF document text
    • http://mcutech.net/files/28057139815.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/47791868004.pdfIn PDF document text
    • http://esejsc.com/upload/files/55007908090.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/30774908004.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/9dba831015d49519dd44a777cbc47fae/jidafugoruninuso.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/gufer.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109050103451653.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/78110205881.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/lifixufotum.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/zujifefewopulowej.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/81391589018.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/93762656369.pdfIn PDF document text
    • http://contua.org/userfiles/file/xowofe.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219244911684.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/movokafevatimu.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/91897798653.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_off0000af0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0F 11172 bytes
SHA-256: a513378857f53223a4923ba52b6932feb8d1ba557366e7310c63d35874a81965
font_01_sfnt_off0000c903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 17240 bytes
SHA-256: 005016a8a3a4eb42e2e61a85bcfda5b94805c7c56e6ebae8299b752a3afd2ecc

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