Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36c28dd4e086d8b…

MALICIOUS

PDF

76.0 KB Created: 2021-09-23 06:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b52f2ac8d889ace0dc6f7f299ff55b23 SHA-1: d533cb32672e781c805c271511250892635e859a SHA-256: d36c28dd4e086d8bba5843f512f4eb4b359ff68058068e40a6f22b65d86fb714
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a large number of links, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the ML_NYX_PDF_MALICIOUS score strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vieclamday.com/userfiles/file/30824257877.pdf In PDF document text
    • http://oreade-breche.fr/userfiles/file/93413146153.pdfIn PDF document text
    • https://ipmgrouphr.com/uploads/news_file/3722610670.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/3142072102.pdfIn PDF document text
    • http://leruichem.com/upload/files/37609225434.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/67676597036.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/xepifuwarenovataf.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/somalisasesibazuzatu.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/gopitejaxonijij.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/9982314874.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/gibujenarodanuxibufowemix.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/27412521719.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85135926407.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/xajirozulefikuzibabilo.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/fopopoxevamarap.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/82545955846.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/39199283464.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/2115153131.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/rufodejakafi.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/96247992144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=after+effect+cs6+full+crackPDF 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_off0000c391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC391 10356 bytes
SHA-256: 1c24f086c45f7ecb8e965f352349d10a6f779ecc64dafa161ddf1c6bb9cfe88b
font_01_sfnt_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 19044 bytes
SHA-256: 6ab89be0899de1d1eadaa98b90f0aff81dbd665f6ba75303a13be977149b5813
font_02_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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