Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ee73877d606a82…

MALICIOUS

PDF

72.9 KB Created: 2021-09-13 13:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ff15752ee4e61fc7b0428f05b428806 SHA-1: d521d59b5f7f73e6a72fa832effb5777005ade0d SHA-256: c6ee73877d606a8273a3ffc0bb993172c9ce4109966c334bba236e21cbf7ab64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and the nature of the URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://yds-wcv.jp/free_images/files/pidesupen.pdf In PDF document text
    • http://homestationrealty.com/userfiles/files/nuraboriti.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/tufofurumezu.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/bilulejixesipixaxixe.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/ginit.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161342168ab3a7---fixixubu.pdfIn PDF document text
    • https://km2804.com/ckupload/files/sisuxanedikaxikutofozej.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109051131314309.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/mixuwa.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ee133b900e4386e0e978b46a33583812/66223552830.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/33462406486.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/6433928401.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210905_211040.pdfIn PDF document text
    • https://deepex.hu/hirek/files/31247904496.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/wubuvamoxepomavi.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0912/7167fd7b2736662fc80c967675956cde.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/50056021052.pdfIn PDF document text
    • http://aurora-c.jp/files/files/79662325362.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/mivajedakezogotesu.pdfIn PDF document text
    • https://redac.ch/upload/nugaxawopefonaweva.pdfIn PDF document text
    • http://intertravel.hu/_user/file/46096481938.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/6552364626.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/gejorarawukanukam.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/nawetajopiduroruvagukexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=shareit+2017+kaPDF 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_off0000be7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 15996 bytes
SHA-256: c01ed69e95670fd776076caddcf009c5ad6110f842a7c6d23724d6f5b2ed64a1
font_02_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 10280 bytes
SHA-256: ccd5b5fae876b7058d3dc78a707e9c12f0843568cb3a6266108a3fd7f8aa3f2c

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