Malicious PDF — malware analysis report

Static analysis result for SHA-256 75640fe1d0f3ebd4…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 00:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc4f735eff52701fa2feb7d5393d3d96 SHA-1: fe26320f4d6282fcd378a519e6bc205b94ea5532 SHA-256: 75640fe1d0f3ebd4ce77872f1d1c50f8225fd0a1335d3b3860dc05285cf277f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, including a link farm identified by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to the link farm, which hosts further PDF documents, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wxhsbl.com/ckfinder/userfiles/files/20210921_053403.pdf In PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08ebd6a9e---23393774900.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/82048130003.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/megin.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/37471549164.pdfIn PDF document text
    • http://dobermanncz.eu/files/76569119303.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/nuwenomosoto.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/b77kjhai612lp43l3equg6ig5h/16061545980.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/mizeveneko.pdfIn PDF document text
    • http://unsersohn.com/images/file/67325442582.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/nowovupekanifimuz.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/28850111503.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/natavax.pdfIn PDF document text
    • http://winso.tw/userfiles/file/11570858388.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/kopivegudugexaxinevawov.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/velane.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/pabomubokinuxadajerisovu.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/38516632782.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/80438767259.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/11275382732.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/fokibuvewogo.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/72742708394.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/dipijuz.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/gitazufowulurijebabalo.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/9701156039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what%27s+the+best+fortnite+gunPDF 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_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 17984 bytes
SHA-256: fba6d0019d798e7ee20864898431fdb2014396c10146d9fd594ddde064afc336
font_01_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 10712 bytes
SHA-256: 336e59dd32598bd38d64f85d11b0d692cf03d23b0624d37cd4458fca3174ed53
font_02_sfnt_off000120d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1