Malicious PDF — malware analysis report

Static analysis result for SHA-256 4923fa8e52dc4030…

MALICIOUS

PDF

87.2 KB Created: 2021-09-11 16:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 540b4023c99a3a999dc2b5c7c76df9bb SHA-1: 3242412c19eb467dae29962c95de02dd2c1cd126 SHA-256: 4923fa8e52dc403032c679b92612e86be6dc91aca28a49da1ff09fffb07d2808
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URLs, many pointing to PDF files, suggests a link farm designed to host and distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://clevio.biz/fckUpload/file/71665911347.pdf In PDF document text
    • https://at2-turbo-j3t.com/contents/files/rarugajapofugudunuwelefu.pdfIn PDF document text
    • https://izr.fr/files/69114516654.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/siviboju.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/60599794450.pdfIn PDF document text
    • http://chemicalengineers.ie/images/memazuwe.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135595901983---32222737008.pdfIn PDF document text
    • http://goref.ru/files/file/72801146561.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/mujarorosonibeju.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/75952371127.pdfIn PDF document text
    • http://zubrcup.by/files/files/30305096215.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/53486705362.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/lezuwubanerotalufigapi.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/46366900281.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109101610512274.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/xofibadukubun.pdfIn PDF document text
    • https://orrizon.ru/images/file/73853893185.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/97168817863.pdfIn PDF document text
    • https://arendic.cl/files/8240372772.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/57752215859.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/tegawigivupewagoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=structural+analysis+hibbeler+9th+edition+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 18320 bytes
SHA-256: ff1ec7319a78e4bc34f52c1bffaf02841c80f663d7a469c8795bbd781fc5be8c
font_02_sfnt_off00013545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13545 11312 bytes
SHA-256: c458b2ade36757e249b7cfe48b3899950a1714e13ee5af092c439927a479a1a7

Open this report in the interactive analyzer, or submit your own file for analysis.