Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ef500f9ba7a799…

MALICIOUS

PDF

75.3 KB Created: 2021-09-10 06:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9a1cbb8ff34ab5b9ea499e13bafc41e SHA-1: 9b7ce070c94d0ddad0caf17bc38bf2b17c95f052 SHA-256: 37ef500f9ba7a7995277b5f3902923152c073f1c796d81a83866fb1e7b507cd4
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. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates redirection to the numerous external URLs found, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crewmak.ru/uplcv?utm_term=internal+structure+of+root+and+stem PDF link annotation
    • http://brilspa.ro/userfiles/file///31733783034.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/39557218663.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/21726736359.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/navibed.pdfIn PDF document text
    • http://ebus.cn/up_file/file/7740168224.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a06828dced---13511669585.pdfIn PDF document text
    • http://veitali.com/upload/files/47470680014.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/vuliritetavibi.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/likajejidudejebadinule.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/jimikotarasi.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/lalovusate.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/92752705203.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/gasix.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/94257029548.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/63687535890.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/55603012045.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vabijizukatumuj.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/purawokeb.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/4695673952.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613207df04b7c---sofawifuwenokefi.pdfIn PDF document text
    • http://vhktn.at/images/content/files/55065142338.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/mimiraxerugamubidukaz.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/renezagurebaz.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/fenomudigujulivo.pdfIn PDF document text
    • 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_off0000c35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35C 16948 bytes
SHA-256: f52c81cb3a47d52fc34b2ed6ae1d25172b4637702cbfa9593b94f8eb6d5ca19d
font_01_sfnt_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 10596 bytes
SHA-256: e5a186d25cc130306b4809d226077e98f87f0213714a3cc2c5fc8e72a4a8c9b2

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