Malicious PDF — malware analysis report

Static analysis result for SHA-256 0722ad7df2d38b2f…

MALICIOUS

PDF

70.6 KB Created: 2021-09-15 18:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 153283b0e2e86d69369ea13708ada52d SHA-1: ec3091f5c2c21e593c9ee7a0ed577c9ab162aa61 SHA-256: 0722ad7df2d38b2f0a423058cd7e5f5b77afa1dde6d86c9a20d242542be137b0
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous embedded URLs, many of which point to file-sharing or download locations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming, suggesting the PDF is designed to drive traffic to these sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious purposes, likely to distribute further malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://protrialse.eu/files/files/50355005202.pdf
    • http://pscworld.eu/ckfinder/userfiles/files/70161720851.pdf
    • http://koszyczarek.pl/userfiles/file/punara.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/paxewaka.pdf
    • http://teenmag.cz/userfiles/file/70072869010.pdf
    • https://najlepsze-w-polsce.pl/uploads/debujaluj.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/40031192001.pdf
    • http://bukharaalpharetta.com/sites/default/files/file/dojaxoxaga.pdf
    • https://italvaping.com/file/faputaxejilekorokej.pdf
    • http://batiment-tunisie.com/userfiles/file/84276136584.pdf
    • http://prime42.ru/userfiles/files/vigidexisedinovorenubetu.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/86083095953.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd56c368f8---72256448175.pdf
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/beruvusexumejivu.pdf
    • http://nguoiquangphianam.com/uploads/files/30306181187.pdf
    • https://nedimgame.net/calisma2/files/uploads/gaginutawegubuwowatiw.pdf
    • http://divorce-difficile.fr/userfiles/file/menufezafopiwowokapo.pdf
    • http://chromavials.com/d/files/33143413208.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e9f1cb781176792bdf668ffd6294c905/823690783.pdf
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/17727329140.pdf
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/93217239785.pdf
    • http://inlovehuahin.com/file_media/file_image/file/20147876338.pdf
    • http://suliaok.com/v15/Upload/file/20219111759442694.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/94339324799.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=blacksad+pdf+download
    • 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_off0000b302.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB302 16792 bytes
font_01_sfnt_off0000cb14.bin
9a97c122730557bdd6d9d7f04a0c7769107b6bf5a64658004bc4d903fee6ca70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 16412 bytes
font_02_sfnt_off0000f552.bin
9f9c05c6e108a88681a54f0a8fb300069c01e6568a845fcdb64bcfe22030b2a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 10424 bytes

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