Malicious PDF — malware analysis report

Static analysis result for SHA-256 224744142cb25a82…

MALICIOUS

PDF

72.3 KB Created: 2021-09-12 22:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b10ab5342ce7101ca254b206d6522eb6 SHA-1: ed02965a2ee4d533c31eb919d853e8dde449c938 SHA-256: 224744142cb25a829a4937786ad8a781cdfa0a2b25a385f446757009eb0d9c41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://nusratali.com/userfiles/files/bifelilupebegikozes.pdf
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/sodijobetifoxok.pdf
    • http://tuanayapim.com/rsm/files/84539204868.pdf
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/woxitozaviwokubuwivoxu.pdf
    • http://veszpremlizards.hu/_user/file/xuwigegudizulatenoturovi.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613df61e24d02---47988875318.pdf
    • http://pieseclimaauto.com/files/file/67519629930.pdf
    • http://avvolodin.ru/upload/file/sokuxi.pdf
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/tarulobomuji.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f92b17223c---susigor.pdf
    • http://khotelmarket.com/FileData/ckfinder/files/20210909_0167ADB7551F3836.pdf
    • http://inbond-cn.com/userfiles/file/84001563248.pdf
    • http://aven.su/userfiles/file/gebuzuso.pdf
    • https://mmeasar.com/mmeasarfiles/file/94688271870.pdf
    • http://czdashan.cn/uploadfile/file/2021090223460473499.pdf
    • https://brawlcall.com/ckfinder/userfiles/files/zonida.pdf
    • http://aloisiquadri.it/userfiles/files/78540838193.pdf
    • http://beautifulmoda.com/userfiles/files/21021751048.pdf
    • https://tselectromechanical.com/uploads/CKfiles/files/xatiputis.pdf
    • http://pieseclimaauto.com/files/file/xugefurewubeno.pdf
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/kivifolarero.pdf
    • http://4grd.com/cmsimages/file/65092476113.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ame+badha+pdf+free+download
    • 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_off0000b89b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB89B 16792 bytes
font_01_sfnt_off0000d0b2.bin
1e4ff09f664ca7411d03a1c5e992c63363a77bb7cdb80ca40dfbe436d2988978		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B2 10612 bytes
font_02_sfnt_off0000e888.bin
051cee7c682fe4e0eaf6cb34567ad2d73b5bf48af5146ffad7d9a5c070f11271		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 16864 bytes

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