Malicious PDF — malware analysis report

Static analysis result for SHA-256 9526d7cb152e4099…

MALICIOUS

PDF

77.1 KB Created: 2021-09-16 22:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38985cb873103e8933457d0cff1c7d14 SHA-1: 3d887d4986fe768a9b8e4b0b30fe2d9847aff22b SHA-256: 9526d7cb152e4099d317f7ebed8a869a14544951fe026f83f4447a8014370247
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lead the user to malicious content, potentially via embedded JavaScript or other exploit vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://interwork.sk/userfiles/file/79430075818.pdf In PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/39156496349.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109040651461845.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/85096207160.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/fegixegunake.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109141136594358.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/1097138541.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/44251599524.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/dcbe73d2a20c74b4998a029a993aff48/jaxoxuriwovazapapa.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/30554126433.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/27271116204.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/65451862557.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/vowupedulekaxapol.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/kutipolerowopobezen.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/34023921806.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/rejurijowepotumubewo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613754b4c9439---97367519685.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/26704105374.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/51546122977.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/60772636363.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/64392155033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dead+zed+2+hackedPDF 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_off0000c8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 18444 bytes
SHA-256: 5fa118d6f1012a82a0591277f96ff6c05a123364b439542c367c9e0651d0c521
font_02_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 10012 bytes
SHA-256: 64a28ffd86258df5b771001523e16ec5d486af41405dcf757ff83764606e6093

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