Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c1d5eb23c24707…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 16:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e6ecad2ecfc189a54ba8867f472b7d1 SHA-1: 66894c9a402ca0ddf06086cf363a92015548d369 SHA-256: f5c1d5eb23c247070bbc005a62dc56e00631b5f1799379c729ac82892ac7e77f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan activity. While no scripts were directly extracted, the PDF structure and URL distribution suggest it's designed to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://posicert.com/upload_fck/file/2021-9-9/20210909191437114697.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161405833aff84---41089524816.pdfIn PDF document text
    • http://irinabailey.com/upload/files/52882934440.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/28388546103.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/poxulaj.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/7016597488.pdfIn PDF document text
    • http://podarox.ru/public/files/77849320585.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/91456662123.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/17755706789.pdfIn PDF document text
    • https://12shio3.com/contents/files/tasuwozagamatufutogife.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416eed9f7fb---devatobarenuleduvowuremo.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/wowusozebipomuka.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/33344087782.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/32097048624.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/febetowefunob.pdfIn PDF document text
    • http://104408017.linker.tw/files/xevopunobegu.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/japemivonewisazonekasi.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/fukigifosanexikaxarun.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/talugoxosimeguro.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/97208111273.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/77715782101.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/jixazaretisofav.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/batogominemabometimukuzuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=best+quiz+apps+androidPDF 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_off0000b231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB231 10700 bytes
SHA-256: 279029013f12074ee336c6023da37107b8216fbe56c23e7a9fec1193cd9f8b46
font_01_sfnt_off0000cab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB6 16576 bytes
SHA-256: 4196a779276e12d2058599f10f27cea0ac57ac8cc872b3664a3a55f3f87659f5
font_02_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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