Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b164892dfc8c8d1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-30 20:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4ed390f67908e0d4a546002b30e61b02 SHA-1: 117bae4945f2c20864c33ca5caa40ad6929f59b3 SHA-256: 9b164892dfc8c8d1ddb53414da7b77af467d47ee5b3f702dc703d90d0b40bcf9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, containing numerous external URIs that form a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for phishing or distributing further malware. No scripts were extracted, but the structure suggests it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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 https://sadex.pl/fck/file/86070197510.pdf In PDF document text
    • http://auto-spec.ca/fck/file/92605411656.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090321455664.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1a064ee9c---61103465333.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/93065165215.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/loninawanunonuwosigorig.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/xarunilanomiraz.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/92424186555.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/98703160674.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6cl4tv5e4c8n4ukdet7st7voac/94810770770.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/liwelemezowoselukuxetax.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/31354551884.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/24529204650.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/83158891560.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/77085646265.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/78419377657.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/56501640777.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/51252715379.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/49196277314.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109201049509296.pdfIn PDF document text
    • http://hueide.com/upload/files/tugazuxumixoran.pdfIn PDF document text
    • https://preciseenergygroup.com/media/tubinewejapi.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/23456340440.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/motogopitinesede.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/ziwipuxofedakakoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chromecast+on+mi+boxPDF 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_off0000ce41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 10724 bytes
SHA-256: 3638c45d386452983a48c0f7225dc77df5767080414c3cda85e3cd9bae4ea711
font_02_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 21428 bytes
SHA-256: 771ac456a1b8560a3024fad4d5d36f28d22c8b6ed583f33453f901643afa97a7

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