Malicious PDF — malware analysis report

Static analysis result for SHA-256 956b849c218f82f9…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 22:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd614e8fcb08c7a1a1f074099205762f SHA-1: 25d17067cc18645e507d3bf3ef17fbc80010b6e4 SHA-256: 956b849c218f82f9a310937f73e032f36a7aa317405b24177d58f3c869570ebc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://michellenevinracing.com/FCKeditor/file/tamotupivavixuwifaxejitak.pdf In PDF document text
    • http://madmojo.com/fckupload/file/24719822193.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/zodulodegajesakirori.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/ligosafedelisamefolixaj.pdfIn PDF document text
    • https://wmu24.ru/media/file/fudojulenomovitujobojod.pdfIn PDF document text
    • https://senegal4d.com/contents/files/42274849674.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/27780024555.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/8960380137.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/79299973569.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/tojugavuxirirajamop.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/2580685333.pdfIn PDF document text
    • http://vasa-project.org/fckupload/file/61785192741.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/3756344865.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1630778858napepuxetutotox.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/xelizolatoxelaveju.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/62451229304.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/08/file/zerimuwagutebuboridad.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/1214784734.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/wuxirafepiraja.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d317f744a1---35956153662.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/75354308129.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/76608926857.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/gowuvop.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/vegadameboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=movierulz+watch+bollywood+and+hollywood+movies+online+freePDF 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_off0000b0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F8 11300 bytes
SHA-256: b08326ea39a74d370411608097ca98ef68d3fc2453129b8fc15a3eb63d1a8f5b
font_01_sfnt_off0000cb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 16728 bytes
SHA-256: c8d9af63854178536f4180fabe21a28977ec5ef68ff19d0ec911860067b09749