Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e33c51b29fea22f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 23:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e14822aad90da3a064c5c8d444448e81 SHA-1: 534a6ea4dd48f7a43135e7dbb9b77d006fc03039 SHA-256: 7e33c51b29fea22f154d35522668aac8dec54fa3a8ff65eb9e7df19dad205780
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tinavaron.com/ckfinder/userfiles/files/75280077752.pdf In PDF document text
    • http://kusistoconstruction.com/userfiles/file/sebilonutojutev.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/pikevodifaj.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/33264727583.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/fezogawepafuduvidogukugo.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/guvose.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/23909293860.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/xawerin.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/94064403064.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/94674729853.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/40653377664.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nusoratakiborikedili.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/fuzeg.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/nigekipadir.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/94796748820.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/55674327181.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/kuxok.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210918_053812.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/wawepovipanajalevowolepe.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091818270224.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d0fc45ddd---gofegidutanazosuruzuve.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3d5a8bd8d---roditimaxazit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=watch+the+creature+walks+among+us+online+freePDF 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_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 11056 bytes
SHA-256: ddbe4ce263466830fefad87f0f2a78cf86be3ac8adb4264a2a9e73f041c918b1
font_01_sfnt_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 17444 bytes
SHA-256: 9d381c8cac5087ca74ea55e66bfac055ac2b4db5ea989bd05d4008ee6fe28fbf

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