Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d29799e96a0f45…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 10:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c82a8023efba257b2985511d6dcd8ca SHA-1: 93371fd04c2b60aa1e865403abb872e69666bda0 SHA-256: b9d29799e96a0f450be18360722478ace96587ba02151381d376a842475fe0c3
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 delivering malicious content. The PDF also contains numerous external URIs, many of which point to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.taxivanclass.com/uploads/ckfinder/files/28535122392.pdf In PDF document text
    • http://www.painters-restaurant.com/userfiles/file/14399097495.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/24076964407.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/rimeka.pdfIn PDF document text
    • http://generaldistco.com/images/file/84952854253.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ae172c28---61050052991.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/zakumonamodutevogugikumo.pdfIn PDF document text
    • http://retailcop.ca/files/60700626448.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/29544813119.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/77189670136.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/kegorer.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/15855260445.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/pepadogitipivexibisomerir.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/fagafuravoruj.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/gitetaro.pdfIn PDF document text
    • https://gilbertems.com/videos/file/9652064735.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/37961074318.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/jebijojerim.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/suvumufesebuz.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/wobopixomanapegij.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/zifaloso.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/73108337966.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/12321120686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=chal+mera+putt+movie+2+onlinePDF 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_off0000d7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 19128 bytes
SHA-256: da32231431b74a0f742d881f012d50a8d9b0866e22a43649ffd8851fa3ae6436
font_02_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 10664 bytes
SHA-256: 2782fc3a62391f6a60b1f149813545bbfaedceb299d45eba932e4dd6018aee17

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