Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae0a9aafa1a8fb7…

MALICIOUS

PDF

85.5 KB Created: 2021-09-14 04:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccdd6b87f854114f93c2cc77ce43c0ca SHA-1: f2e14cd988f8829474bd1cae78a6b00d51151ce4 SHA-256: 4ae0a9aafa1a8fb762333bcc5016a83614fbeda76aba1df0ba0a9b64c3c7f4a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to external sites, which is a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this behavior, suggesting a deliberate attempt to obscure the true destination or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://creative-format.com/upload/editor/files/25893187831.pdf
    • http://miass.realxenon.ru/uploads/files/29099052431.pdf
    • http://descanso.verareyes.com/ckfinder/userfiles/files/75055658012.pdf
    • https://zahidnawaz.com/UploadedImages/image/sunedusezuli.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/mbc9m37kceh0vh55fikmmg5t9a/modepebanuv.pdf
    • http://learnazia.com/fck/imagesfile/reketijevitofegudu.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/gamoruxugime.pdf
    • https://ladachess.ru/userfiles/file/napuxemozulikogirala.pdf
    • https://angkoronetour.com/userfiles/file/88436879481.pdf
    • http://cmrivestimenti.com/userfiles/files/32720265192.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efea671488---tubagifepobevovej.pdf
    • http://studiofranzoni.eu/userfiles/files/xuzubiwokexorexisive.pdf
    • https://digireg.es/upload/tipezawobug.pdf
    • https://bearings.vn/images/ckeditor/files/66723784273.pdf
    • http://smartdeal.pl/files/upload/files/31967388789.pdf
    • https://capitalsyndic.com/userfiles/file/ginetuwotumolezo.pdf
    • http://studio-rivetti.it/userfiles/files/15407316631.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/12716839208.pdf
    • http://lsphc.com/userfiles/file///jemekoxesazefikepubomon.pdf
    • http://konberdbio.com/upload/files/88134847160.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/58027315803.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=action+hero+biju+full+movie+watch+online
    • 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_off0000e83c.bin
22f3f1694d8fcb9a80fc71bbff8aea98b5b4e694d9975057c0d18a09b63fe5a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 10936 bytes
font_01_sfnt_off0001016b.bin
bdbbb84c21eff20e19c93152319fc252c5d0c2f656845a5ea7240d8402db98d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 18156 bytes
font_02_sfnt_off00013021.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 16792 bytes

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