Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ad679d6944e7b6…

MALICIOUS

PDF

87.6 KB Created: 2021-10-12 07:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 231bf423084f07b82037f169c3f5bfe5 SHA-1: 51e5f98d3fb53d548c0b8311a18cb768a9b3b7ec SHA-256: 11ad679d6944e7b6eaafbab52f49e721ae90603636cb9beaf64752c26e802150
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely leading to phishing or malware. The embedded JavaScript is a common technique for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147779de1f34---12922456370.pdf In PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357b4f152f3---56894710854.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/vosoluvej.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/lagutiriluw.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/sewarujiri.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/maromiroxodinikido.pdfIn PDF document text
    • http://prompol.com/media/file/ropapibuzed.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/31372725388.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/56472415154.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/luvufibomemuved.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/61161190994.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/27528093692.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/54585069854.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/51299685636.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/zukufovivipuposozefamo.pdfIn PDF document text
    • https://www.renouer-auxerre.com/ckfinder/userfiles/files/jilafuloje.pdfIn PDF document text
    • https://raljob.com/userfiles/file/wigosuduzadef.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/62626535731.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/wafowarodedubad.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/fopugisegajevifulanebima.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20211006123612.pdfIn PDF document text
    • https://siroyensao.com/upload/files/28991183549.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/titipek.pdfIn PDF document text
    • http://webursitet.org/Files/file/67316036491.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/xawipexixa.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=my+chase+schedulePDF 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_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 19908 bytes
SHA-256: d57eb9ee7668ab12cdc73a22aa97cf5250e0b4b503a61e93ff67ac7fcf669990
font_02_sfnt_off00013a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A39 10160 bytes
SHA-256: 9567b39f1a3c677f9e555284b66f706abe554b5615346d3aff06fb0b50871390