Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d640bcdd74779c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 20:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8d354d21fc9610438c5e975bd9882a7 SHA-1: ddeccf76e45ff40220336b77dd9a293d5ab21c7f SHA-256: 46d640bcdd74779c8c880bed2b31505b7645545b8bf59d8e3385875e10ca0691
126 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the PDF is part of a phishing campaign to lure victims to external sites. No scripts were extracted, but the presence of multiple external links is indicative of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613aec100e9ad---60409112274.pdf In PDF document text
    • http://fc-junajted.com/upload/datoteke/18792708805.pdfIn PDF document text
    • https://kapefashion.com/files/files/85448131280.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/wutudepadenap.pdfIn PDF document text
    • http://iscelenie.info/files/file/tubibopokorupizasisadujog.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/15039862071.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/ximujunabogenapurexevo.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/30968270063.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/rizug.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/88570745921.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/kerakonolat.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/nixagipadidobejetuzot.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/xedosew.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/pitazofopegilexigowowegim.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/zipufedusonanovomujabun.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/53958503117.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/16324905673.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/48827247817.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/wodasenuzi.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7905b182bc13ff486dd0fafb180c5ea3/powuduxidaxurip.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/41140714704.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/datokelizewuzedaxok.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/buturovopelosezum.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/77848354406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=stream+android+to+pc+with+audioPDF 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_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 18116 bytes
SHA-256: c849466fb18b804bddc16a463947a7517e53934db7baaeea92d4fcc60f2ea20d
font_02_sfnt_off000121c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C7 10824 bytes
SHA-256: d4e64f2cd472514df4af0f971721f4335b678389917eeff3d489b1b911be61ee