Malicious PDF — malware analysis report

Static analysis result for SHA-256 c362867879e754c2…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 08:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0f9d98104121456fc08f2dff85caa528 SHA-1: 65426bd86d251a8d4f4fe244af25dc23e2582073 SHA-256: c362867879e754c2a9e12789a6cab18db4f6b29146d9a09a9366b0f0c83f6b29
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 a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to deliver a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zeguvietnam.com/uploads/ckfinder/files/bifixaribapuse.pdf In PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/religivojaju.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/nuwogosobokefuxogonukix.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/4186883009.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/bomizex.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/walonov.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210912045136.pdfIn PDF document text
    • https://brs.jo/userfiles/files/45793974171.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/24133782347.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/kenuguvuzem.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/povezipade.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98dd7d490---tosovizurexa.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/42136752997.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/15619320139.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/disitigefexax.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/40179129665.pdfIn PDF document text
    • https://hoalavender.net/upload/files/jomaw.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/43293279048.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/sarerabimuf.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/pekujelewizoxoxinegojizas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=free+internet+apk+downloadPDF 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_off0000ad98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD98 15412 bytes
SHA-256: 1f20369fd97c482c0dc20318fed2edfd6c40c6f1f7ef436d984345dd71897811
font_01_sfnt_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 10372 bytes
SHA-256: 0318be2006d2ebd230f43ed4d6c668e672dd1cf133e258f70f5cf2f8bf4a00da
font_02_sfnt_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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