Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa376fd6836d086…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 04:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a579c2976d5e67515455e27c5a5552e SHA-1: 9f4100f40282d025e4ca20170929f8f72b0320dd SHA-256: 9fa376fd6836d086c705003fcc69e8c5cba984835a048b10e18aad49424a0558
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF also contains numerous URLs, many of which point to disposable domains and are part of a link farm, suggesting a deceptive purpose. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or facilitate further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://onsale.social-push.cc/data/fckeditor/files/9957726959.pdf In PDF document text
    • http://clingac.com/d/files/gateluruwasi.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/buwedudafimak.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/62591810328.pdfIn PDF document text
    • https://domilot.com/uploader/files/90475021460.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/vanujinimodomofaso.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/tafimubugejuvega.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/53262928856.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403be90b434---piwemenorapuluvefulo.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6d4df13e2---98034788224.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/16603288050.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/57355826958.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/vabesilesabisofupoz.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/lelekugurala.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/bupev.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/nuketanusosuxolekukiba.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/lotufurifimusitabilado.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210907_081442.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/32640763768.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/37269937298.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/wufolegavur.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/34919901452.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/38293134539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=automatically+pair+bluetooth+androidPDF 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_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 10944 bytes
SHA-256: e65ae772be6d615e2742615af363cfd029b20d03cfe6d798b7793f0bb0c67e17
font_01_sfnt_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 17352 bytes
SHA-256: 493637224e25584262f873cf4e6600da9cf3fe4ea839a23f27dbdcc09cc60260
font_02_sfnt_off00012805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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