Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfaba5a196a8cde…

MALICIOUS

PDF

72.6 KB Created: 2021-09-12 13:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3834507611969964fe02362d019cdabd SHA-1: 909ac952d6706c20406a66db8a3d5ded62d31804 SHA-256: 8cfaba5a196a8cdea601f63b4ace5743ec2b9ba5e4ea677a056f89e7fc178cbd
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 payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs suggest a phishing or scam attempt, likely aiming to trick users into downloading further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://zhavezbozi.cz/data/file/36037524357.pdf
    • http://restavratorstvo.com/ckfinder/userfiles/files/fimibapevegofidamupezimam.pdf
    • http://one9five.com/userfiles/files/zitefo.pdf
    • http://abpaluso.com/upload/file/64545225577.pdf
    • https://gazeta-msp.pl/user_files/File/60587380025.pdf
    • http://akcompany.vn/uploads/userfiles/file/70372769410.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138e42cb3e85---xefew.pdf
    • https://vienhung.com/webroot/img/files/3299371392.pdf
    • http://realtor-madrid.com/uploades/fckeditorfile/5672528321.pdf
    • http://dworbieland.pl/userfiles/file/37680644352.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d65086b098---80512198357.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/45130232514.pdf
    • https://joebalogh.ro/imagini_ws/48562531258.pdf
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/xogizupaxososofobekixo.pdf
    • https://mimpiindah88.com/contents/files/kiwowinowet.pdf
    • http://grafichesirio.com/userfiles/files/gofaxomizaj.pdf
    • http://colorfusion.us/admin/images/file/41972228708.pdf
    • https://vicotelecom.vn/static/source/images/file/96750730902.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/94937933742.pdf
    • http://vnos.vn/app/webroot/uploads/files/pofigolumenulolen.pdf
    • http://yuanhebiotech.com/upload/files/jejuwogomotibejatawugujo.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/20241370530.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=word+to+pdf+best+converter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bac6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC6 16792 bytes
font_01_sfnt_off0000d2d8.bin
f8a5ec799c9631f724f135ff89b96521e2040671c2f6a02f5a7d0393d0e007ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 16500 bytes
font_02_sfnt_off0000fd70.bin
1efb1fcea115ee53e7d18fe4253768a6844bd22f63bb5773bd6917758d014f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 10512 bytes

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