Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67dad66337d7ab4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 02:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e87267f96d8ccfa9a640e03b7612873e SHA-1: 3c8e86c28750b25e7351d8890cafb51ced60dc59 SHA-256: c67dad66337d7ab48043de4abfeab74079c6bb67ee9761d23db9b7dbb49f28bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests an attempt to execute code, likely to download further payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://hightopeducation.com/cms_uploaded/file/dutibibuso.pdf In PDF document text
    • http://biblioteka-belzec.pl/upload/files/visojukomukizutizulo.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73428057356.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/minufosuwaxatadalofavorar.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/buvixesumilomuwowutenulop.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/56133783080.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/matip.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/61096631751.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/2507971347.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/basulonaleluwubevuxadif.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/galaxuwipidirijovefurod.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/5718881565.pdfIn PDF document text
    • https://gdaniec.com/upload/files/21956474549.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/28239425828.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/99611416311.pdfIn PDF document text
    • http://www.bash.cl/media/file/967728213.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/fodota.pdfIn PDF document text
    • https://invest.pl/userfiles/file/91583921645.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6ag261boch6iub5epr86l5bm34/fupamefozudile.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/78209963873.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc709e5f19---wogozijenukulipi.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/nawazuwivibutuxiwu.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/58446832411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=convert+audio+to+mp4+videoPDF 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_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 10616 bytes
SHA-256: 35131b6091191ad7833b69be0d941e05434d7c1550ff16bf5305b3164b3f8194
font_01_sfnt_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 21660 bytes
SHA-256: 974bb12cf553133fd5e04bf03eebdaf1b7f4e623ce6e7a9c0a753c08a929e5ce
font_02_sfnt_off00012d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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