Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bda5a22e50c74f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 23:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1fa0d71dc9ca27d928394d0e96b56d12 SHA-1: abd9b381f3847bd85dce606cd60ebdbbf91ae053 SHA-256: c3bda5a22e50c74f81ba9e4180a94fd054509735dcb1c7e98d4f5090852db3fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/30622243875.pdf In PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/23297845812.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/41164006471.pdfIn PDF document text
    • http://goldmustang.ru/files/files/35913192101.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/jopuse.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/80594306787.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/mugisafobetenokiso.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/mosilimunotuwewedu.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/44442423248.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/71008768647.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/jonitawimazew.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/wazijivos.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/pujogoset.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/soxexamekotabedi.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/jizekexabawidubuw.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/mopoparanegevogefu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613715b0a3940---mewumibufatugerawe.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/kukegejabamigivebixojo.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/kizunerosaj.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/64553584872.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/vawajuj.pdfIn PDF document text
    • http://52963566.com/upload/file/202109020422246603.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/29564093588.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/sesis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=8+prayer+watches+pdfPDF 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_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 10664 bytes
SHA-256: 091b4076fd7f6519bcc1a2adb194c4a40051c2c2a7f783f2d852626657b9ba4d
font_02_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 17544 bytes
SHA-256: c3f7bbd7b9f0b2d7801ff84b2214c86628b569c4803ad984f8eede3b682f4a86