Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0be7741fd600ac7…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 14:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92801ff63d79fa73d81693cc519c34b8 SHA-1: fee5d8afae23c44018996a5fa65e22fbfaff2eb3 SHA-256: f0be7741fd600ac72ec6ea15356b5be9ee003859ad931d138a6406412add79e8
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within PDF documents. The presence of numerous external URIs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming campaign. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://ketchas.ru/uplcv?utm_term=supernatural+season+6+ep+5
    • http://tcihk.com/userfiles/xajuwaroxuse.pdf
    • http://vijyaiprismcrm.com/userfiles/files/53371284374.pdf
    • https://webmanagement.colortown.ro/images/file/70110390612.pdf
    • https://cuatudongsaigon.net/uploads/files/87185317179.pdf
    • http://sm.ac.th/ckfinder/userfiles/files/mowiv.pdf
    • http://www.americaninvest.net/upls/files/vupufebuba.pdf
    • http://abwingssuffolk2.com/uploads/files/pufelinipowo.pdf
    • http://pn-tech.net/userData/board/file/senogifakewikononujavalem.pdf
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/xibatavoxon.pdf
    • http://swhos.com/upload/files/10349425886.pdf
    • http://ruihuitax.com/files/file/divifirolusukig.pdf
    • http://beveragesgs.com/userfiles/file/41788690542.pdf
    • http://bitree.net/ckfinder/userfiles/files/dovakojadoguxaboforige.pdf
    • https://numen-wow.com/userfiles/cloud/files/nidoxugubipemipukow.pdf
    • https://soi.icami.mx/ckfinder/userfiles/files/53942079291.pdf
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/boruvadonuvo.pdf
    • https://cingenito.ca/upload/editor/file/57397198955.pdf
    • http://modero.vn/upload/files/xizibisaxarapodozaxuno.pdf
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/sixojagazadusotadok.pdf
    • http://club-integra.ru/userfiles/file/gizoxulupakinefab.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/wiloxejabudolutumuvun.pdf
    • https://galerie-louise.be/userfiles/files/gulad.pdf
    • http://dobrasekacka.cz/userfiles/file/26933422936.pdf
    • http://secondhandgraphics.com/usrfiles/file/81135942196.pdf
    • http://softtox.pl/new/userfiles/file/nawulenewurogofabozusunov.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f862bc1ec8---65734127315.pdf
    • http://astmasme.com/userData/board/file/molufox.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_off0000b528.bin
445e9dd76627f67f808b758bbb84985c163c7219db7d64643c3ce07b06e5dd57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB528 10628 bytes
font_01_sfnt_off0000cdab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 16792 bytes
font_02_sfnt_off0000e5bd.bin
d0734aa2cde076d0bec3f8ed1fd8a2b92221d0ed9fac884fc2d0124a418eef38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 15628 bytes

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