Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5dd0f99ce434ed…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 14:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3525745e7a1c6fb8a26fae067f3f4dd5 SHA-1: 4995c568c46bdc1609d79d77c13d2641e30ac7d5 SHA-256: 4c5dd0f99ce434edab6439e205cf1bf1bbe0bed7f9fd3141ba9ade23d1d78886
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this being used for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of many external links suggests a watering hole or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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://pistant.ru/uplcv?utm_term=daftar+game+gameloft+android
    • https://siangyun.com/upfiles/editor/files/zejomalezaboxisulome.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/24cc6819003a19bda2e9e464cd49c81d/91971335298.pdf
    • https://fratellifurloni.it/file/wasafakuzuxutavefiromojal.pdf
    • https://t2sc.me/userfiles/sigerebixapirizeg.pdf
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/3591591343.pdf
    • http://chanakol.com/ckfinder/userfiles/files/4777052375.pdf
    • https://brahmagnanam.org/fck_uploads/file/71794652304.pdf
    • http://ageddfjtjgrade.pretty-match.com/upload/files/44235179520.pdf
    • http://100gastro.cz/soubory/files/fegajokonogezuwom.pdf
    • https://mimpiindah1.com/contents/files/89772259385.pdf
    • http://www.binghan.my/userfiles/file/99284518006.pdf
    • http://sage-chem.com/image/files/20210904_091101.pdf
    • http://rebeccaosborne.com/uploads/72696838309.pdf
    • https://gaadalagi.com/contents/files/76284800059.pdf
    • https://schodyperfekt.pl/user_upload/file/68954446658.pdf
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/fojowafelorisitafip.pdf
    • https://brillimet.com/uploads/files/202109040936212940.pdf
    • https://farmaciasacoor.com/site/upload/file/32661380340.pdf
    • https://semut73.com/contents/files/34446401126.pdf
    • https://albizy.com/ckfinder/userfiles/files/kolupekujidodi.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6d7c83a296c199e0f2796c7c1e3746d5/60857360114.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jadid.pdf
    • http://x-mobio.com/upload/files/13540737689.pdf
    • 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_off0000b432.bin
c72c01f6fc11a37da50f1cd132109dd4668c8c5a3fdac93b978bd08a604ea6be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB432 10528 bytes
font_01_sfnt_off0000cbe8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 16792 bytes
font_02_sfnt_off0000e3fa.bin
dfdae41ebb99e4e8158ebfc82bb69600f24a36cd8b041ec03881c55cb0ac5e8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 18508 bytes

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