Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af8ada74b3b3620…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 18:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 486cee6d1477105424d35a00460a9c73 SHA-1: 8b6c5ef8ebdcbd82682f8da9b3402370ce766e64 SHA-256: 5af8ada74b3b362075562ff1e514dc614f162d09b43bcae3f3d3f1f2f9c3567f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to suspicious domains, many of which are part of a link farm on disposable hosting, indicating a phishing or redirection attempt. The PDF structure and embedded content suggest it's intended to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://synerhu.ru/uplcv?utm_term=search+everything+android
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135886310bbc---junejugewarazutatuditus.pdf
    • http://oris-am.com/editor_up/nuzigulofatamipupamo.pdf
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/bewenado.pdf
    • https://mamap.in/ci/userfiles/files/tibepimizovoterino.pdf
    • http://telektrans.hu/editor_up/satavugigujitetevoturu.pdf
    • https://optical-axis.com/uploads/files/202109081736192663.pdf
    • http://bloodfaces.de/attachment/file/paxexiwam.pdf
    • https://tecnicadovolante.com/images/file/norinadoxuxa.pdf
    • http://barahi.com/assets/userfiles/files/suwodurogu.pdf
    • http://baobianhkhang.com/upload/files/78990674345.pdf
    • http://glttek.com/userfiles/file/tofupilaguvuluzuxagununas.pdf
    • http://tcyy88.com/userfiles/file/2021090305263373499.pdf
    • https://impulsa.mantareys.net/uploads/plantillas/files/zerakuxoj.pdf
    • http://www.w.radeton.cz/ckfinder/userfiles/files/kemalelel.pdf
    • http://hacoauto.vn/upload/files/52096128258.pdf
    • http://clinton.abwingsmd.com/uploads/files/bogirususulexe.pdf
    • http://elcivan.com/admin/UserFiles/file/mosufulanoruko.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff53e81672---28043357074.pdf
    • https://asi-filter.pl/files/file/tefopuxalodexenila.pdf
    • http://imhome-listings.com/userfiles/files/vegunisalosedux.pdf
    • http://bordahusfeldolgozo.hu/editor_up/relutotexosamujoweru.pdf
    • http://stellarp.com/userfiles/file/tisubuzujerajenawopaka.pdf
    • http://clean-ecology.com/Upload/files/dekedexidanudajisus.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/11663845847.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_off0000d6bb.bin
5ad09f931257a2327b7b0229b34af51b8b26e5d703b5853fdf1598466d504835		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 17208 bytes
font_01_sfnt_off000102b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 16792 bytes
font_02_sfnt_off00011ad0.bin
c8c5ba7bd076e9991c9506e5d8f572c892fb95c433d921813b8576ad6ebd858a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 10692 bytes

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