Malicious PDF — malware analysis report

Static analysis result for SHA-256 106b6359093664cc…

MALICIOUS

PDF

78.7 KB Created: 2021-09-14 00:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29bfed6cab66e62679ff521aeec58f2a SHA-1: 93ec5cdcaaabd54e87baaef98a87b65c9903bf3e SHA-256: 106b6359093664cce8377d3d853edd603d71784e5c7a87f10ad152a7c199aa74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://inwebjor.ru/uplcv?utm_term=chrome+scroll+with+arrow+keys
    • http://coytex.net/ckfinder/userfiles/files/44089117957.pdf
    • http://balaton.varosom.hu/userfiles/files/32962560404.pdf
    • http://digitalpolicycouncil.org/imagenes/file/28990656661.pdf
    • http://gojjang.com/uploads/files/nadoroxo.pdf
    • http://galerie45.com/userfiles/file/46177452458.pdf
    • http://naphogacomposite.com/upload/files/53080707092.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/5b77425f9f4760eba8200f75b226066c/96704852264.pdf
    • http://controlsystemco.com/cache/fck_files/file/89159002425.pdf
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46933714280.pdf
    • https://aayams.com/userfiles/file/71722971213.pdf
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/fonelulofetakavafomudekup.pdf
    • http://1-sanya.com/blog_images/blog_/file/28024282852.pdf
    • http://bartuceviri.com/userfiles/file/5438512202.pdf
    • https://fzclicks.com/demo/files/editor/file/xukulinovajasiguwixiwibe.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/66550721083.pdf
    • https://concertwristband.com/resimler/files/31377837813.pdf
    • https://hurghadalife.net/userfiles/files/fojawoxajibumirugufefagu.pdf
    • http://baraanduliaptti.org/userfiles/file/wezumoseruxik.pdf
    • http://lindseyderence.com/userfiles/files/binepatafizot.pdf
    • http://puginternational.com/ckfinder/userfiles/files/3257913745.pdf
    • http://folientastaturen.pl/_data/file/91823765361.pdf
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/paxudi.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_off0000cf41.bin
31dbf02dcbb352eab266e74b56930d520037ce9549c1398364d7924c83be1b31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF41 10712 bytes
font_01_sfnt_off0000e805.bin
663b028d6443baa53751b8d957651edd5d9f15c2b0156f60ee5f4d508fbc405f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 17456 bytes
font_02_sfnt_off000114f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 16792 bytes

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