Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5387731f41880e…

MALICIOUS

PDF

67.7 KB Created: 2021-09-28 13:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 522e0316080769598e6c656f50348656 SHA-1: 09d3c51ea2a95ae3bf4e668a84e0f1515a816a60 SHA-256: 5b5387731f41880ee4ab4072ef0599f2a1a591d71ac3bae4b738d4d6e14e4a21
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 disposable hosting and form a link farm. 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 exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://acecaalcoy.com/userfiles/file/xejegiwezijirudata.pdf In PDF document text
    • http://pradakshinam.com/fck_uploads/file/66142443768.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/72578250729.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/olaxubebawariboxuratu.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/zudebikitavozolonukusix.pdfIn PDF document text
    • http://arucax.am/user_images/file/76449941713.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/jukivogajubaginoso.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/mugafanugav.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/36375071123.pdfIn PDF document text
    • http://turnyras.lt/Files/file/64546951625.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/13977362791.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/vusomasure.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/41388051544.pdfIn PDF document text
    • http://cochemical.com/upload/files/fozojipaloxowenujoduzesa.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/87361674252.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/10797362194.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/tizagapinujupitewegeni.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/62270409419.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/97459966470.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/vifozuxujoxisasujal.pdfIn PDF document text
    • https://topupdana.com/contents/files/ribotixox.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/midokop.pdfIn PDF document text
    • http://domainecomps.com/documents/files/72220899172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+character+recognition+apiPDF 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_off0000ad63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD63 14400 bytes
SHA-256: a2d7caac7ffb88b4c8ef318dcdb36e98479d1d00be1155e2250d9938417d4683
font_01_sfnt_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 10560 bytes
SHA-256: f7cd1eae9eb146ea3374eb09d30d179c022db8efccf68439aa49021aba0d3d23

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