Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c27d0bd3dca4087…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 19:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 09fa1384ecb7b89631555251e5c7d74a SHA-1: 32c2e4ca5e22f680578c91cc9b03369a67d8f7d7 SHA-256: 2c27d0bd3dca4087c20829e374640991c81f460cccc5b9dae5daa01cf6d9ac79
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many hosted on potentially disposable domains. The ML classifier strongly supports the malicious verdict, suggesting the document's primary purpose is to direct users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://studiotecnicodama.it/userfiles/files/79765007682.pdf In PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/wutugavigejamusoki.pdfIn PDF document text
    • http://koddous.com/userfiles/file/55994469963.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/jabevoza.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/72812734718.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/woxide.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/mukuzugowudulafutazixu.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/34454656711.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/juvaxova.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f8950fd580b080aa047a93e2d57a3cd2/dazezefotebubo.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/8253253546.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/12253527687.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/jolezoxebozodita.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/44832746843.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/sorene.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210913092614.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/87061611015.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/59935761716.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f70004d64e---gidomedig.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/dadolepunozaduvurof.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/51839860683.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/94789639690.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/77679018574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=product+key+for+windows+8.1+2013PDF 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_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 11392 bytes
SHA-256: 307105d8d5888440b200f675c8672f15080cad1d92fb208e39ec7ad91ff21b21
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 17524 bytes
SHA-256: 55f41e7299f5c167a88fedf27bf9d5216dcfedd773da639a063905009a2b0bfd
font_02_sfnt_off00012e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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