Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3531fee6608ee2…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 10:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc549a71634b9005c2568e613e09d20a SHA-1: 19d6469c5ceaf42a9dc7ce2d4a544bcd2feea8ca SHA-256: 3e3531fee6608ee2e476118d86fb64d3ab9143aaef34c24b9dcbe3d39f97732c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to potentially malicious or link-farm domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to distribute malicious content or phish for information. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent, likely involving redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • 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://phanphoiongnhuahoasen.vn/upload/files/97832685360.pdf In PDF document text
    • https://tessuno.com/upload/files/61399916a3a85.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/46505991969.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/58607827502.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210907033523.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/tiwup.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/kunofusem.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/gigozewowaxose.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-14/20210914141520220708.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/jidotisi.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f57bfe0220---bodovotibugukexukure.pdfIn PDF document text
    • http://henca.com/files/details/file/gidogafiwimadarirumip.pdfIn PDF document text
    • http://cissi.it/userfiles/files/lapowufuregevolerufale.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/tiwukopenotabujukutuba.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/72316312247.pdfIn PDF document text
    • https://halead.com/uploadfile/1631346270.pdfIn PDF document text
    • https://orrizon.ru/images/file/regibalenidimemu.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/fizegezo.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/79712787350.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/83303408863.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/47c73cf0054493eaf9559d7fe50512df/tuvumaw.pdfIn PDF document text
    • http://confetti-seasons.ru/upload/files/97299807323.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/82256249325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+go+battle+league+cheatsPDF 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_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 19128 bytes
SHA-256: 1226fd588f4c5452f70dd0eb304c9c34dcd5ff31915705533a1e397f946f925c
font_02_sfnt_off000124f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 10816 bytes
SHA-256: 3636d40f4885920c9a11fbe74a30dba626ea6e7e0d646ee4feb79866c2537fba

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