Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7583b656012ebf7…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 14:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5dc3b9b489d7ab19697ca149a54a3c7d SHA-1: 6ffe794f822854022a79e0c0499f06144ef9a744 SHA-256: a7583b656012ebf7551b45075057b62f8a8927562a09f9a431b28b258fdfa2cd
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or redirect users to a phishing site. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=khuda+hafiz+full+movie+watch+online
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/nufevotalet.pdf
    • https://futurefacesnyc.com/uploads/file/jagepowitasafemap.pdf
    • http://stefani.cz/fck/file/21383300376.pdf
    • http://kielcenoca.pl/files/file/60147903751.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/mutewikuserivevexoseb.pdf
    • http://bitree.net/ckfinder/userfiles/files/70205856314.pdf
    • http://edu-family72.ru/content/images/uploads/file/vurakotu.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/9mnvb6ttod28v3s2unucnsrd22/kifijikijebuzenaletak.pdf
    • http://pzhjintai.com/upload/files/80255077874.pdf
    • https://tavio.ru/files/file/luwezigarelamuwunipanuf.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161353eb9299e6---62471030828.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16138746e69cb4---kutuxasuw.pdf
    • http://valdhans.cz/userfiles/file/42551275838.pdf
    • http://hytechcommunications.com/userfiles/file/zedukimumajuguvezebiwud.pdf
    • http://inannamsao.com/uploads/files/bujogiwumazujebakukuw.pdf
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/83634345584.pdf
    • http://hidropro.hu/upload/kebopolo.pdf
    • http://purofirstli.net/userfiles/file/53630180943.pdf
    • http://195exim.com/datas/files/pakigedoxetaguxiworeza.pdf
    • https://corpeverest.com/ckfinder/userfiles/files/logilenulokumazik.pdf
    • http://debrecen.varosom.hu/userfiles/files/10368992075.pdf
    • https://chiataiec.com/userfiles/Proj_Name/files/mifoseta.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_off0000e144.bin
e17802063a468bf2641480ef34a6f7c162b213646c5c90c1ff2598f9870c52ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 10776 bytes
font_01_sfnt_off0000f9f1.bin
4e949be2d01ac0e16a4cbdf242c0a8d0249e18fca2f0b6d3a232832fa29a1337		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 18148 bytes
font_02_sfnt_off000128d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128D0 16792 bytes

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