Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ba7ed55757bf24…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 02:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fcad032cb0447b07a06d3aa2fe585fb SHA-1: ed5b1763386b5ea6c8ac3b1414fcc0481f87a08e SHA-256: 82ba7ed55757bf24b88610e043b0e538a17b0f80fbb77614bbbdcec7ef236334
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to external sites, suggesting a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://snailgame.ru/upload/files/20210902094613.pdf In PDF document text
    • http://skybuildinfraprojects.com/uploads/92502707908.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/juzuvoxilusigaxikugasu.pdfIn PDF document text
    • https://znalac.com/userfiles/file/50360998864.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fa8c56d843f71b4700b833fb95dc273f/xaleraruwofadexiravup.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/39781426874.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/96956497151.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/fidoluvegofabedelo.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/95327580877.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/sinujevofutunov.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/580121932.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/53095146895.pdfIn PDF document text
    • http://ewtch.com/upload/files/33450864247.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/22a63fb0a2acf844938c066611c58d8c/livaxasipijavufunuwiro.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/34747279383.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/sazolugajemopafobuzat.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/mujoj.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/35099062802.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/82646497627.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/wawojuzarolojiloxowu.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/rakubura.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/tujuwesixopiwikijaxola.pdfIn PDF document text
    • https://campermagazine.tv/public/file/jolabizababilopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=present+perfect+and+present+continuous+exercisesPDF 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_off0000b4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 10768 bytes
SHA-256: 24d2a608807b01a7f250c413c89ce0193042e6803e03af136bea41d56f5c0674
font_02_sfnt_off0000e5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 17712 bytes
SHA-256: f20058d3112fbf776cb00a5fb9f7103f8adce369a28d4e8778accdc3b532b83e

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