Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29ad3a203a1ce92…

MALICIOUS

PDF

71.8 KB Created: 2021-09-08 15:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 334e77c7e468cbab46361910c8518431 SHA-1: 170df78f056d9150201f851cf3979303e53bae5d SHA-256: d29ad3a203a1ce924ac13252785c50749fce4a6ec054b13e8901d82af3c6101e
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing numerous embedded URIs, many of which point to disposable domains and are likely used for phishing or malware distribution. The presence of embedded JavaScript, flagged by heuristics, suggests an attempt to execute malicious code within the PDF viewer. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=interpreting+ecological+data+worksheet
    • https://institutdesante.org/userfiles/file/xesurugeteso.pdf
    • http://speckletrack.com/update/editor/file/35916054843.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133623ce9001---91660963980.pdf
    • http://nc-israel.ru/upload/files/fonolasutuziti.pdf
    • http://www.abcklima.hu/data/editorfile/pitud.pdf
    • http://hangtatmj.com/userfiles/4513411268.pdf
    • http://hrudolf.com/userfiles/wujevi.pdf
    • http://ourgans.org/userfiles/files/32918814546.pdf
    • http://extintoresorigen.com/images/editor/bozakurefakafogexolasol.pdf
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/lazobajufive.pdf
    • http://www.larucheapain.fr/ljk/file/31951002047.pdf
    • https://karinbentum.nl/uploads/file/92210935183.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210906_151810.pdf
    • http://bjqyms.com/filespath/files/20210907195113.pdf
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/dizewapiwonevixobi.pdf
    • https://harmony-lazienka.pl/Upload/file/difapadofewanuloxajiziku.pdf
    • http://schokofontaene.de/idata/disofisaxuwosujevumufi.pdf
    • https://yocarbroker.com/upload/ckfinder/files/15508451076.pdf
    • https://vsevolozhsk.mebel18.com/uploads/files/vogodoxalet.pdf
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/gulupidabuxedapo.pdf
    • http://koreadramatour.com/FileData/ckfinder/files/20210906_E212DB293E8F82DD.pdf
    • http://www.recko.ru/ckfinder/userfiles/files/vibutelusone.pdf
    • http://revize-elektro.info/UserFiles/File/siwasulowaji.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_off0000b65e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB65E 16792 bytes
font_01_sfnt_off0000ce75.bin
8e2edd12100fa837e35491596f26659d444bb6c620699a12f86e699f950afca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE75 10920 bytes
font_02_sfnt_off0000e789.bin
7b393c9729079ba51973589c19028c009f824a1ca19b6dfef24b00b3b3a2ebb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 16240 bytes

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