Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c64ec46cf236e40…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 19:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 29eb1b45cb4ab4208c67ff7a3b8f21b1 SHA-1: f2504dea3822d14c42df6816f0e60a98b8921182 SHA-256: 1c64ec46cf236e405c4cd27874adc76c264169f8547a1e60bfc9e56021b58948
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous embedded URLs, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of many external links points to an attack pattern focused on redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://locnuocvietmy.com/Images_upload/files/siximexepupufakazovema.pdf In PDF document text
    • http://mintaialuminum.com/d/files/tezopojujitemiv.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/68794293543.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/31936126095.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/nusomuvexesegipofos.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/61878586728.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/22551056604.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/13246638551.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/22161362803.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/fanimesonodaxodisenixosu.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/68190690954.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/44479172045.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/8199495805.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mgr1opkqduuc2giv676i43arhq/68506620581.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/zawuwopizulixawufapiripem.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210927115350_okingy.pdfIn PDF document text
    • http://jump360.co/upload/files/20210913233001.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/33910487583.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2c16532629e41c66adfbd2c47806df47/32328383115.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/53652352066.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/22978528489.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/bupiv.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109021014065771.pdfIn PDF document text
    • http://cochemical.com/upload/files/20114126528.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/fawikinofak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=d%26d+3.5+complete+arcane+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_off0000b26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA82 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_02_sfnt_off0000dd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 16164 bytes
SHA-256: be8e550d13fa1c45142de10a5b38fd4847f843c83df6d1ccb71dc784980a173a