Malicious PDF — malware analysis report

Static analysis result for SHA-256 00da999e863c0fa3…

MALICIOUS

PDF

86.8 KB Created: 2021-09-09 05:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac8da9a58de3023152587349fc07743c SHA-1: 88085a9f7304f95fd942e9acc7a862dfec581067 SHA-256: 00da999e863c0fa38ac6ef3e1e87dd14b9a6c246995d9d61645463ef647ba938
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, a common tactic for generating ad revenue or distributing malware. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to appear as a download for a game, likely to trick users into clicking the malicious links. No scripts were extracted, but the high number of distinct hosts and the 'utm_term_redirector' heuristic suggest a coordinated effort to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aymexco.ro/ckfinder/userfiles/files/sarozutobofap.pdf In PDF document text
    • http://tomekorea.com/userData/board/file/kuvugabi.pdfIn PDF document text
    • http://intertribo.sk/files/23342309812.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/38506272203.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/vesekezagodatogobetazowu.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/vezix.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/20426397851.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/48304930127.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/defado.pdfIn PDF document text
    • https://campermagazine.tv/public/file/28959902910.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210908185827.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/11623387221.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/49460604900.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613912a389c64---jovej.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/sojef.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/80636726471.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/wapiteregu.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/zulonadokewodawufegeje.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/69212843927.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/novug.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/78383447999.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/4610151137.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/26398569856.pdfIn PDF document text
    • http://viettruss.com/upload/file/viwos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=assassin+creed+identity+offline+apkPDF 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_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 18412 bytes
SHA-256: 01934583f748d1ce04aad05da0200ad63b7e18d45283606483c5a02f041ba752
font_01_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001348f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348F 10800 bytes
SHA-256: 5f45ecb567e19b0e1b763cf5ca89b7d060a1080c3bf87d8f5967f5ab51a27936

Open this report in the interactive analyzer, or submit your own file for analysis.