Malicious PDF — malware analysis report

Static analysis result for SHA-256 2481810dc665db73…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 21:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: f9fd0f5bd67046dcb0fc5ca94f5c8e4b SHA-1: c6ba3173a77e4d5b667ee560296e87996f0b0094 SHA-256: 2481810dc665db73c19242d7e5e81da939ab5bf37f1ddc8da65fb6a2b0890306
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://k12kos.com/ckfinder/userfiles/files/92158961822.pdf In PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/19204348980.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/67783532597.pdfIn PDF document text
    • http://erdbau-rauch.at/buvikogunomawizajujisip.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/pulatotobefujoxen.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/79619854156.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/33768908740.pdfIn PDF document text
    • http://8njl.com/userfiles/files/pabed.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/45090996440.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/73383304338.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/77591914071.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/vomiradabo.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/89584258534.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/45057277225.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/8655492424.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210902_3C0773B465E5DB54.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/zegibovolubokugokij.pdfIn PDF document text
    • http://373113.linker.tw/files/38640455714.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/71866522937.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/20057776418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=phone+keeps+rebooting+and+optimizing+appsPDF 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_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 18324 bytes
SHA-256: 7159d98aad78f672e1b7c54bb169eed091aa5cce5f8ac47ec0e24a1719c46a65
font_01_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 11084 bytes
SHA-256: 4545c7791d6686fdca4d96efed015526f883e659ff8647a9e9ba6963b0b5f26b
font_02_sfnt_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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