Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ad39f5b94b1e6f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 13:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: ebe17de5ae9e85a3608cf6bdfc2d19b5 SHA-1: d833d59044241569d1a8db49e5bbc55458db6eba SHA-256: 50ad39f5b94b1e6f0ccdadffb360f86308c464a05bd29835fb7b97092eb434b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are structured to appear as file downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=filelinked+on+android+box PDF link annotation
    • http://efuturesthai.com/uploads/files/rogijamovujo.pdfIn PDF document text
    • http://goldmustang.com/files/files/96685865572.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109151159142056.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/wezugogesoduzuwizemigo.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/kisulogaduzu.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/79902116375.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/87934491606.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/tedoridapiboko.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/nezomapegodajopoti.pdfIn PDF document text
    • http://esipro.be/userfiles/file/faturu.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/65797089092.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/xoguwirobimafavikeg.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/51664452551.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/gerowetabanoxeb.pdfIn PDF document text
    • http://pedraferro.com/files/files/25863624908.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/42866381142.pdfIn PDF document text
    • http://blueyee.com/upload/file/16174806459.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/41164705081.pdfIn PDF document text
    • https://pindimana.in/uploads/file/nadorezipodapelisa.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/73271873526.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/vibilawurusizorirug.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_off0000d190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD190 17684 bytes
SHA-256: 8e1a70321a947abff2ed854eadb8206730c56b103974e45eb9bd163e250bc695
font_01_sfnt_off0000ff0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11723 10288 bytes
SHA-256: 0c6876d1cb54a7c3aed7bcbdb008a924fc5aabee1a7db14c42ca7bee208114e4

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