Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2911093f7cc9980…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 19:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 762a39de8f8145bcc71b07fd04f4ec56 SHA-1: c2d9a2bee9eed94ce271c42609689f754b45e343 SHA-256: f2911093f7cc9980f5ff735968539e16bd2a8bebea74f89972d5e499c73f195d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://architettoannalisatinelli.it/userfiles/files/fanosofalutubisubirefo.pdf In PDF document text
    • https://888nv.ru/userfiles/file/71809813387.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466ec356e50---notozofunulilopaboxuwosa.pdfIn PDF document text
    • https://citronel.com/userfiles/files/lajasu.pdfIn PDF document text
    • https://luminex.pl/upload/file/relujofedipikugat.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/pelutazurix.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/89116048905.pdfIn PDF document text
    • https://sapporopools.com/contents/files/54196748143.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/zusosiwaw.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/fizowivejewawo.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/73171804765.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/gifojifepejuxirusotiworiv.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/megiraguxajazasenixem.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/muzikolagi.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/96511966973.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/kepisamubujubi.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/xizomuxiwesozowosinup.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c89b91a1d1a99e06aa9d8b7e05aedd8f/lelusujixogitudagatek.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/divovusopenisumudonefux.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bizexowalaxoxata.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/vobigi.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/18218567074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=house+of+flying+daggers+watch+onlinePDF link annotation
    • 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_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 11048 bytes
SHA-256: a1ea2e047259f10b21eb7d32ed19c24ed2179b93737a7622ac381c018ee05435
font_02_sfnt_off00010eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEF 17448 bytes
SHA-256: 07a5ce50f35e413918c4311a2f5ba4fd900457ae1cbe44c491d72a6f72820752