Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba9b2d0b15dd195…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 04:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: def5da23ce932d30403f06298db8720c SHA-1: f40cda886e1c354bf3c53813e71c391040c92a0c SHA-256: 1ba9b2d0b15dd195b2a844859fc41af662c482874c4d6998bd4e7cd3ebe61bd2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many of which point to disposable domains or are used in a link farm configuration. 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 0.9953

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 https://thegioidongphuc.net/ckfinder/userfiles/files/mubotabudajexutanijadifem.pdf In PDF document text
    • http://mannaz.pl/userfiles1/file/keked.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/wafebezitibere.pdfIn PDF document text
    • https://oferta.lt/i/File/61167003462.pdfIn PDF document text
    • http://rayer.cn/d/files/vujisometolanolimewaji.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/tagax.pdfIn PDF document text
    • https://invision.buzyhub.com/files/67175768975.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/78302318490.pdfIn PDF document text
    • https://glozor.com/userfiles/file/92677990197.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc175ccc7c---20398025099.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425f443d811---38147744094.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/80107710146.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/jitupezegizosi.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/94220739192.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/42039939002.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/vovomev.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/rilokusowaxe.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/63721676111.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/wezadisize.pdfIn PDF document text
    • http://trubaopt.ru/content/file/68010422065.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/34110686961.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/lixijirotob.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///49937100738.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/34077351103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+add+spanish+keyboard+on+androidPDF 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_off0000d30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 10868 bytes
SHA-256: 9411bfee5ada5819852b2d52fb89ada30c2c695b20e580b9c0ecdf6aab18b165
font_01_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10400 17356 bytes
SHA-256: 441f986a3c7cdcdf61eead16c7ecc073157e4bceabf443ec151458dc8100fff0

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