Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d8ee534716c407…

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 17:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5fff6b44caec1b2f5a7883ea7e698ff5 SHA-1: 306c8a822f0dead33687a517c7c917f2d2e23c99 SHA-256: e4d8ee534716c4075af80eb065cc74c24ac4b0c94bf04a7d611d234da663619e
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the document's purpose is to host a large number of links on potentially disposable hosting. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

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 https://crysiq.ru/uplcv?utm_term=linux+kernel+panic PDF link annotation
    • http://www.siposferenc.hu/html/22913103487.pdfIn PDF document text
    • http://datcat.vn/2018/file/46634882934.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/46754875943.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///62036827027.pdfIn PDF document text
    • http://chenruichem.com/upload/files/pidosixul.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/95778754357.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/gitiz.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/339688604.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/sukod.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/65159791991.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b2f847daed5a0222a062ef1b319f9545/jofexusav.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/39284276582.pdfIn PDF document text
    • http://potlista.com/file/files/50111359656.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb6c9ac1a---55670069694.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/86817710238.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/lugajo.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/wiluzexaxudigegezome.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/lugif.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/nojorekujedafeserezis.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/berazumovogufub.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/84607194344.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/jusuwaziwenib.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_off0000b27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27F 10232 bytes
SHA-256: 2a7e22151aaf12c8c83428a33ad2a79c050a407329c0395435dff87affa9219d
font_01_sfnt_off0000c988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 19140 bytes
SHA-256: f659a26bec15b772efc1bd85dfa85f09bfb8685a22be56a64519928a282fd466

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