Malicious PDF — malware analysis report

Static analysis result for SHA-256 def690e1664e9dd5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 21:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b312cb132ee91f659d12dae27fbc4a4 SHA-1: 2549f265947221494331460207864db9cc0771cf SHA-256: def690e1664e9dd500bee6d45e9181ad0174a516e9c749a9dd693e4d90cf75d6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to one of the numerous external URLs found within the sample, which are often used for phishing or to download further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=cara+menghemat+baterai+hp+android
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/gigikisoditulibojoxufileb.pdf
    • https://ww150007.linebot.net/upfile/files/20210906213752.pdf
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/17923997014.pdf
    • https://grootformaatspandoeken.nl/userfiles/file/ruluwijidebojisilexulev.pdf
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/14047950808.pdf
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/mokurukilirobirezimozesip.pdf
    • http://garage-fuji.jp/js/upload/files/41306035555.pdf
    • https://pastijptoto.com/contents/files/16503872906.pdf
    • https://suacuachuyennghiep.com/uploads/files/43088390638.pdf
    • http://abwmercury.com/uploads/files/82312210953.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/vasuvagivob.pdf
    • https://ibeguiristain.com/userfiles/files/nevenajutuvenisubap.pdf
    • http://fasson.vip/images/editor/files/zebusole.pdf
    • http://bajcsidavidfoto.com/_user/file/lebabuxeramo.pdf
    • http://lezeckastenakosice.sk/upload/files/58918730133.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/mizoxafim.pdf
    • http://dunakeszi.varosom.hu/userfiles/files/52764398045.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f644a766b8---binukafij.pdf
    • http://radiopoint.cz/userfiles/file/25332907106.pdf
    • https://monyetmesum.com/contents/files/xogafitivoxipizitinopewor.pdf
    • https://yesilkoyluleriz.biz/resimler/files/vilivelofupiz.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da44135083---kilizowe.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_off0000e126.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 16792 bytes
font_01_sfnt_off0000f938.bin
3c47692f2df87b0f62dc835c7d18b63dfe9e893fdf8ef5192712f52cc25a2375		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 16724 bytes
font_02_sfnt_off000124b7.bin
75609ac270a952c02f9b2c7efd3e5fb4a5ef19ac4bf07c247306b96a3ef046bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 10796 bytes

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