Malicious PDF — malware analysis report

Static analysis result for SHA-256 9781905ac676558e…

MALICIOUS

PDF

93.7 KB Created: 2021-09-18 12:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5d5f1b41e3c1d3a16fad0845683bece SHA-1: 4942d439ffcf207382ec5eef9bb386ee5677c9c5 SHA-256: 9781905ac676558e74be397bab220ae60f550d18ad179a5aa41b01a3280b2af4
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to what appears to be a link farm, with many hosted on disposable domains. The PDF structure and the presence of embedded links suggest an attempt to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://washlounge.in/ckfinder/userfiles/files/kinusuzafameme.pdf In PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/11524644093.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/gamomudobaxadelefafimovux.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/wabef.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/didobeluzo.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/41445628506.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/2166868024.pdfIn PDF document text
    • http://cartopack.be/Images/file/49714779153.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/fabokuzizupafimopiji.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/43833462188.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/72808667484.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/71okfcasudahcka83p7j2l7gfr/61064149389.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219382408579.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/93708024251.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/99442380291.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/41332752207.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/vulomexizefodopagaraj.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/5033785600.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/69202436127.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/84918549360.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/poxajutoxudazuluvusinim.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/rixoku.pdfIn PDF document text
    • http://mobil-tech.com/files/94569597576.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/vazapavurilabezelij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+material+app+iconPDF 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_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 10488 bytes
SHA-256: 73fd3da3eb702dfa16251a6e2271aa888cd49cc4200777882608bb2311d1d30e
font_01_sfnt_off0001215f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215F 17988 bytes
SHA-256: 5c7e7cb150ba324daed91ba2007a5004eaa86c1f213b941c7dba6e4ef869b975
font_02_sfnt_off000150d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1