Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce05e8e6e3a50b3…

MALICIOUS

PDF

97.8 KB Created: 2021-09-20 23:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf69b5c45ad9f717b791836e3ad5cb57 SHA-1: 40ca3f1f04ca770a25eec79be0ff0925d35ef167 SHA-256: 6ce05e8e6e3a50b33c9313e57f1c9e47f04141132433ada245ae8e990ef8ee3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with many pointing to unknown or potentially suspicious domains, suggesting a phishing or malware distribution lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM firing further supports the idea that the PDF is part of a link farm designed to redirect users, likely to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://hyosung-gulf.com/uploads/file/59874669280.pdf In PDF document text
    • https://preciseenergygroup.com/media/71627754227.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/22916821103.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/65308198770.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d580fbb910---lebupizot.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/75216901161.pdfIn PDF document text
    • http://yejida.com/userfiles/file/betovatuzanuvivi.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/47912553431.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210917002324152.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/kunezewipefezajesas.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/34196475035.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/nubuj.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///58511578833.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/mesoduvadarubowe.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/robukagebesop.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/xopojijolamuwirefigikel.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/43635057352.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/37326502819.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fcc32ad2d---ruvawezupejipegolufibasur.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/netarizifokefazilibe.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/mobatijowizewokovodetegos.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/90253922138.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/38566260527.pdfIn PDF document text
    • http://tchid.net/userfiles/file/13596606027.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/17124655667.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/gejatobalire.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/67050029679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=electroman+flash+gamePDF 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_off00011b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001338a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338A 10676 bytes
SHA-256: e90dfcd31f85c83286ade82301ef6ecc53863514c7cc9ada2196b817206cc405
font_02_sfnt_off00014bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD7 17676 bytes
SHA-256: 1592e2d8b32174cd81f42f1c4df45f089728b3ca88c2c19b89afc3d09d667482