Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbaf2aecda608d59…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 10:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d6d85e29777bd1b1f22d1ee7a02d415 SHA-1: 585ea2369d8b2b551cf13d59b287b619b727643b SHA-256: fbaf2aecda608d59f84174f6a9fab793fd9e402b169a769676533e6934e8a5ae
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript, indicating a potential for malicious execution. It also features a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The presence of embedded JavaScript strongly suggests an attempt to download and execute further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=samsung+galaxy+s21+vs+iphone+12+mini
    • http://theemasternetworker.com/ckfinder/userfiles/files/wamezotimifubam.pdf
    • http://mg001.cn/upload_fck/file/2021-9-7/20210907164903545641.pdf
    • https://nhabe.com.vn/ckfinder/userfiles/files/69881603174.pdf
    • http://www.tsahimmongol.com/uploads/images/files/pijuleme.pdf
    • http://canvangdientu.com/images/file/41016126717.pdf
    • https://chachachat.info/js/ckfinder/userfiles/files/sutokaledisavasakaka.pdf
    • https://sapthagireesyathra.com/userfiles/file/58198453347.pdf
    • https://lanhcongnghiepthinhphat.com/upload/files/55017220268.pdf
    • http://elard-group.com/ckfinder/userfiles/files/ginug.pdf
    • http://wish-pharma.com/upload/files/gebitexovisemapupidib.pdf
    • http://blueyee.com/upload/file/141343115455.pdf
    • https://srilangkapools.com/contents/files/gagerewij.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462cc38b7ba---jawaf.pdf
    • https://universal4shipping.net/userfiles/file/tusozadotavatibaganomo.pdf
    • http://grandfiltr.com/files/file/11119463068.pdf
    • http://squash-fitness.cz/userfiles/file/59287641377.pdf
    • https://silky.ae/images/bulk_images/files/gukazobogozulumofun.pdf
    • http://htbestcomputer.com/media/ftp/file/40514311306.pdf
    • https://tonerihned.cz/userfiles/file/subizolajisikixidakugepo.pdf
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/lipawizodosota.pdf
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/bezupokeraxew.pdf
    • http://soyaksiesta3.com/userfiles/file/59430695211.pdf
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/taxopejijarope.pdf
    • http://alhouti.com/userfiles/file/90169618203.pdf
    • http://www.mab-solutions.fr/upload/file/77106150212.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_off0000cbd0.bin
620cdd22544fcbcc6d4e9baf5db1acb8648b1385e4ace2d68a2253c5a29fbffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 11132 bytes
font_01_sfnt_off0000e5ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 16792 bytes
font_02_sfnt_off0000fdbf.bin
2e287335bcbbd0bf44d94bf06e920a1ade79a0495a409ebe8e00d17e2bc0c2dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 17940 bytes

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