Malicious PDF — malware analysis report

Static analysis result for SHA-256 2510dc3a3d9cf46b…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 03:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b292bc6fa0ff39f4009fdda9633ac6f SHA-1: ce38cbb0e5c461565dcb89d4a8dd93a87ab76404 SHA-256: 2510dc3a3d9cf46bd3a4d3dc650940e2d5092abc4948d5338ab30f3a868ba97f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. The presence of multiple external URIs and the link farm heuristic indicate a multi-stage attack or distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://campfirewtx.org/userfiles/file/59389924288.pdf In PDF document text
    • http://esebtekstil.com/resimler/files/96353752559.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/32641358570.pdfIn PDF document text
    • http://keitbg.com/images/files/nisovosimatamijawataju.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142740879a92---subosomifesivofowa.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/jevatapewiso.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/6073964868.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/pikegidaxojegefuvet.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/dasul.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/didasivuwapexe.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/ruzititerobu.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/5106835431.pdfIn PDF document text
    • http://tabletopad.com/images/file/54105620644.pdfIn PDF document text
    • https://triosms.com/userfiles/file/79084126917.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/92903303903.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/95352784545.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/98135711732.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/milakexeloravebunesi.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/26227132091.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210916130438_xu4zsj.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/74868695769.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/zenowixivarogowomewize.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/35650773518.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/nimurijoposevuvede.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/5700318417.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/vimapatujixawolupuvafuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=papa+louie+2+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_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 10340 bytes
SHA-256: 5ab7f200a32d49a34f6ae01108810e912d9d930b6466fd8f4f643e1341caf1ad
font_02_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 18408 bytes
SHA-256: ef0a6771a2bce93ebc5013fb6315a0317e13171fbf3b7bab13d303aa9add09d1