Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8485cbe3b0b72df…

MALICIOUS

PDF

69.8 KB Created: 2021-09-12 07:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6194330bf64b57e8dcc59f9ac5a50ba2 SHA-1: 1c7f45990bbb0e38e0216bb3845905cfcc35cedf SHA-256: f8485cbe3b0b72dfae28dc414b8066164ee7820fba128a4af92bdfbb3013249b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://dymenahealthcare.com/upload/fckeditor/file/49532894823.pdf In PDF document text
    • http://goang-hann.com/uploads/files/202109081357255535.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/fuwilexuguw.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/34032096174.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/3515420961.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/53873111901.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139b4dbddf0e---doxoxibagej.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/tedawubimopizejiximumibem.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/matakoxifefiwulo.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/ziduromipanivefeduzufuwev.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a2ff2a7b---guluxugixizemu.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/91165016410.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/woperepagonejadijore.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/92519202813.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/68626013848.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/24594958651.pdfIn PDF document text
    • http://www.pvvc.cz/files/69352294908.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/rididazifesegokomidij.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210912071946.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/jaxajupiserol.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/365165353.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/9096997528.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/waxexewonidise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=protect+privacy+androidPDF 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_off0000b4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A8 14844 bytes
SHA-256: de90c3786f471a1505c3c55347755d856df0011aa592e9682b1bb08e30da95fd
font_01_sfnt_off0000d9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 10472 bytes
SHA-256: e82c402cba90aa38f8c7319e32f304dbb2334b68ef2a348261d25de45c82d653
font_02_sfnt_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1