Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ef362d16987b31…

MALICIOUS

PDF

78.3 KB Created: 2021-09-27 02:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c2ae3892c373bebf18ffc103fc317c55 SHA-1: 7588e3c8bbd00343702c99c08ad52eac42711ecc SHA-256: c1ef362d16987b3160e52ff59aebf152aa700b268eb4d0cca4e9617ad0c6f043
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to a link farm designed to host a large number of PDFs, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure malicious content across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ticketsperiodico.com/galeria/files/bokefurebuwidewoji.pdf In PDF document text
    • http://agrion.org/upload/fichier/vofebudarifitabo.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/69322602352.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109010657014726.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/nafadekoxu.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/kowux.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/kitawefelawakiwesukaxim.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/mejulawoketugugugiberopob.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/dupajobifivujukume.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92985841764.pdfIn PDF document text
    • https://irantruck.ir/data/file/28324449023.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/70185317113.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/23611636250.pdfIn PDF document text
    • https://kultmotor.hu/images/files/xaseg.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/58862010125.pdfIn PDF document text
    • http://dsraxys.com/uploads/wadunemomepe.pdfIn PDF document text
    • http://sakem.org/userfiles/files/xosasiwatedotonudazerer.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/43086988671.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/natojexawotuzitoxedidev.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/7924978004.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/69495779029.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/bageg.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/60302700159.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/rojuwubabedokuzenof.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/1675263579.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/47553265631.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/36318521312.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/zogojiriwanabara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=short+and+long+cases+in+clinical+medicine+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_off0000c503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC503 19812 bytes
SHA-256: 325f36167015334a9d700e12da93a58e80af5ab33e3e24761c9bcf8601c6d5e5
font_01_sfnt_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 11140 bytes
SHA-256: 2f444c1ec7606657cce74e18cc6206d263692a04201eb43777e34d20f92e0005