Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a8395fdbbea37a…

MALICIOUS

PDF

78.4 KB Created: 2021-10-08 19:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c891c5f51d6b431ce1983034e9939ea3 SHA-1: 819808dafe0ee7366827c1911af10a9f45da59b3 SHA-256: e9a8395fdbbea37af1b6a864f4bf392face5892f6e0774e8b4c8ab7e6a265b8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution suggest a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://tridiart.cl/ckfinder/userfiles/files/gukumoj.pdf In PDF document text
    • https://officialbacknumber.org/editor_up/natowuruxi.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/zupujuxedabiridufitolu.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/37194630334.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/27450879342.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/37103643715.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/turagipolevup.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/3306394150.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/37514400842.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/gajok.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/5083449861.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16156921660d6e---7790963920.pdfIn PDF document text
    • http://chinalabware.es/d/files/xusukezamigipalozenabug.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210920085929.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/76658324496.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/daxoroladavanazerawem.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/lesegubunotodufegitetefot.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/mivogupivo.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/kurixuvuxefa.pdfIn PDF document text
    • http://fittbikese.hu/files/file/zolat.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/78757534077.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/61758841127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+calculate+average+of+cricket+batsmanPDF 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_off0000cabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABD 11152 bytes
SHA-256: ae9bb78bd6e5c0310b61b404551cc1930a82eefc7bdeab7bc9ca5f747edfa2c2
font_01_sfnt_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 17948 bytes
SHA-256: 3a509f92028345fe2fc66a129827fa6d6682a8b425caa81e2e24ce2dd1895c6a
font_02_sfnt_off00011385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1