Malicious PDF — malware analysis report

Static analysis result for SHA-256 61105167e73bda41…

MALICIOUS

PDF

72.8 KB Created: 2021-09-11 11:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 09b9a8e66810730d63daa7eea4bc7c90 SHA-1: 70aa071abae1ef9ac038313711f7aa031bd08039 SHA-256: 61105167e73bda41550baea3a750c556e653e5932414e9014a9f2affcd9e0024
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and numerous unknown URLs suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://speckrepej.com/upload/file/74062377672.pdf In PDF document text
    • https://alamansyria.com/userfiles/file/dawejatoduxirijeli.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/13099015857.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/kexerowulavofo.pdfIn PDF document text
    • http://iknow.pl/files/file/79356802050.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/susete.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/39689577875.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/fipuzoxu.pdfIn PDF document text
    • https://kiptep.ru/file/51079689.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/nusujedoleroxeb.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/jokunotilusaxas.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/81853088080.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/jojolal.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/palikodizevirovuler.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/musaxefafow.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wivomegorakimazas.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/37297761829.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/vuzozerorogogorepaja.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/jejuj.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109022001006547.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/kepuv.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/jebalefogenuwu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ok3b6a32ehf66avnv47353snu4/vebusuvonodeponojuwamo.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/nukalolejuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+wallpapers+for+mobile+phonePDF 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_off0000b817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD029 17692 bytes
SHA-256: c346436c206d825d3dc252ba201c66c593565d32a420a0cf418411070ecb285a
font_02_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 10728 bytes
SHA-256: b4212c4165dedb137db641d65c512c81ccfc6947ca56e09b239a4146f93cedd5

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