Malicious PDF — malware analysis report

Static analysis result for SHA-256 5357ee7c116ba0b8…

MALICIOUS

PDF

88.3 KB Created: 2021-09-21 02:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6602365fdb8b0c88293b8e725e017ca0 SHA-1: 0718d429bac02bb83838d26506b667fe49971b46 SHA-256: 5357ee7c116ba0b8e9fdd4f9e745370d6e3001c452f725a3c7e38bcd45631fa5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JS points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=ceh+v11+labs+pdf
    • http://currycornersugarland.com/admin/images/file/purevuboxet.pdf
    • https://mycultureis.com/FileData/ckfinder/files/20210921_295B794604987872.pdf
    • https://profesa.net/userFilesfile/49296804638.pdf
    • http://telegid.tv/userfiles/file/taxilusogowobaxabepefizal.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/65297587240.pdf
    • https://escaletravel.com/userfiles/files/91609225599.pdf
    • http://harckocsik.hu/userfiles/file/49097208139.pdf
    • http://pass38.com/images/contentimages/files/xomovijawemovideridotome.pdf
    • http://spy-military-labs.com/userfiles/file/81756913745.pdf
    • http://wojno-stal.pl/pliki/file/41532659130.pdf
    • http://3dtechgroup.com/uploads/image/files/pixabemo.pdf
    • http://bulmarconsult.com/files/senudexiwetabedotelo.pdf
    • https://stka.gr/ckfinder/userfiles/files/webakiderisutezuvubixizi.pdf
    • http://anpharma.net/upload/files/nikibo.pdf
    • https://adproissy.emailingmanager.com/uploads/editor/file/70215670067.pdf
    • http://tantos.jp/js/upload/files/nodoru.pdf
    • http://zhuoer.ltd/userfiles/file/98985251176.pdf
    • https://infotechloyalty.com/bot/ckfinder/uf/files/45579299120.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614170a09f846---84888262171.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/fugujerigix.pdf
    • http://sntaviator.ru/ckfinder/userfiles/files/dedoxuxelesumexat.pdf
    • http://t-eamplus.de/web/editor/files/77137605657.pdf
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/8168723691.pdf
    • https://asiapharma.la/files/files/54759248440.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_off0000f30c.bin
da23aa5483290fa552473962a4faa2991b0a9abe7744175be57f4f0ecd83c02c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 10372 bytes
font_01_sfnt_off00010a7c.bin
92ec95569912a2f7866cbb401aa9d33577af1c2d82b814038efb8f2f41b2ebbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 19020 bytes
font_02_sfnt_off00013c0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0A 16792 bytes

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