Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5a87e987696eae…

MALICIOUS

PDF

70.4 KB Created: 2021-10-01 03:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 915e3936da35ebd8f34b1131a8fa7992 SHA-1: bd64d131ca85b76a6c4c8fd1225e02fd70005d7e SHA-256: 8b5a87e987696eae67e1bca6146b3148b906ba9cb2e0d9f5f56758bac500c7b6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the true destination or spread malicious links across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=watch+midnight+gospel+online+free PDF link annotation
    • https://dreptultau.hotnews.md/upload/userfiles/files/23225763774.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/bedabefuxuwelixujopu.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/navawe.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/8655416941.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/vabipowidizak.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/nowoxete.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8882ac2c---duvodiwikezav.pdfIn PDF document text
    • https://ksboutlet.com/file/files/legosa.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/mikeji.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/56158862462.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/57637920345.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/litax.pdfIn PDF document text
    • http://xycrusher.com/d/files/laxokibiwepajifilazawexox.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/16890811069.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/73868123069.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420aaf1e8ab---82120173198.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/93482032160.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/63346377456.pdfIn PDF document text
    • http://lg-palette.com/upload/files/97885180466.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/tubogupob.pdfIn PDF document text
    • https://viceda.com/userfiles/file/buwulezenor.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/69228079766.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/denozasan.pdfIn PDF document text
    • http://airsoft1.ro/files/file/xemadegale.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_off0000b068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB068 16472 bytes
SHA-256: cdc05bc31061c2c8cffd22b41eb7a76f31c7489f7226cef9e6e46e8b2b02263c
font_01_sfnt_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 11060 bytes
SHA-256: 18256f03bda58b78560f773089e4cf8fe3d0bb47d74b36448bab077629f30d1b
font_02_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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