Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db8df8fdc344401…

MALICIOUS

PDF

75.7 KB Created: 2021-09-29 00:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3b90ebc37ba99ad5e07da94ce585621 SHA-1: 8ef12ef66b86707edb62a144e1c93ee15439ae9a SHA-256: 9db8df8fdc344401600fd4f3c284377d372a056f6724a863d83569417ec30caf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded URIs indicate it's intended to redirect users to external malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=cell+phone+microphone+not+working
    • https://fenicia.uy/fenicia.com.uy/uploads/files/69240250589.pdf
    • http://gonzagafood.com/userfiles/files/91758890114.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613866e18e036---82917709417.pdf
    • http://www.physedu.in/newsite/userfiles/files/lafakerov.pdf
    • http://mlsconsulting.net/cms/files/File/fusezikob.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614db0fbd30c1---rabanemow.pdf
    • https://bcbc3399.com/upload/files/mepevutemumedan.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/17805762910.pdf
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/wikatanalisur.pdf
    • https://plewmal-d.com/Uploads/files/65572796024.pdf
    • http://sobinco.cz/ckfinder/userfiles/files/pezufitepozet.pdf
    • https://kede.org/userfiles/file/vumokedutosilodafuv.pdf
    • https://mariellatriolo.it/public/file/tufaluropinevo.pdf
    • https://habibitoursegypt.com/ckfinder/userfiles/files/97760155298.pdf
    • https://asiapharma.la/files/files/20816323194.pdf
    • https://ambalatender.com/upload/files/76990451768.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614729465823a---98899476480.pdf
    • https://marathonroller.com/userfiles/files/zixudopurofebewiw.pdf
    • https://dananeye.com/uploads/files/202109131754342539.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/52886236374.pdf
    • http://moderncarrent.com/user_img/files/34585023187.pdf
    • http://www.aragonemprendedor.com/userfiles/files/supalimoxitipivizosapo.pdf
    • https://liantoong.com/archive/upload/files/nixozigiroz.pdf
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/mironukosenajojovinija.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/wuvos.pdf
    • http://style4.allwebeasy.com/userfiles/files/70094862366.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b29a.bin
c8e236944fe944b9e7357ec4cb117d0244ff8a53ec720cdc1b80e709ba528d44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB29A 10700 bytes
font_01_sfnt_off0000cafa.bin
01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFA 16232 bytes
font_02_sfnt_off0000e0d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 16792 bytes
font_03_sfnt_off0000f8e5.bin
3cb131a3b325e745a5ad541d9b7744f72c6e12bc9ad03da0c3cdd25b71e7af4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 15912 bytes

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