Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb2597ee1b71645…

MALICIOUS

PDF

76.6 KB Created: 2021-09-28 04:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a07f8568590c2bf108d1dcdb3c975a69 SHA-1: ca76ce600d78c2babb7aadd2aadd4e5be57d9a9b SHA-256: cdb2597ee1b71645335902a399a949dbb7fe2a17d80a56167010c7e0d7304826
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of link farms designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown-reputation URLs strongly suggest a phishing or scam campaign. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=how+do+i+get+android+11+beta PDF link annotation
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133255dbffe8---nigazu.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/zujijejiwubovenokipilu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5cf982614f91f75486f86c01fdabcd99/xewuxakuxodajele.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/livotut.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/25722585760.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/22332555095.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/ropesetot.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/97533928661.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/lagopuvipu.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/99536080858.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/17836702059.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/22001640482.pdfIn PDF document text
    • http://erictex.com/ufiles/files/48517660693.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/liwuwar.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/3844880930.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/wufogatabasilikute.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/mamoxudeka.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/9669866783.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/17005528213.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/76206433618.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/25225768246.pdfIn PDF document text
    • http://congtyvima.com/images/Download/bowowujotimu.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_off0000c19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19B 10476 bytes
SHA-256: 3b24e2894137f60489894e4e1df4740350f3225ae21ae51396abecbee5b18458
font_01_sfnt_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 19804 bytes
SHA-256: cbc91ce739561058894b0ea7865c1b2a27d682d1ae4c0ca6b955e816c9f7f4c6

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