Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6282037249b12d0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 18:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d20b6af49bae126bb162d6416d6cd825 SHA-1: 7a4868ff31c446edebf8ec00168a965eb6e13995 SHA-256: b6282037249b12d0f6e8ac2e1d9bb96e96565a88b8ecf20ed727832dcf62e487
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the ultimate destination or evade detection. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://malagi.pl/user-files/fck/file/jexanuf.pdf In PDF document text
    • https://topupdana.com/contents/files/ribotixox.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/voxifabewozokativoral.pdfIn PDF document text
    • https://ibextrail.com/editor-images/paremu.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/lujadabaxiwedo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16145cccf2e646---xuwonobumulomivobon.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/datakaxujitemirose.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/nuvujupegizinas.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/17289326248.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/betuvubesorefexis.pdfIn PDF document text
    • http://ergakiland.ru/files/files/feretoka.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/kutemuladow.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/gubolekufifaxana.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/9347750680.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/24065987176.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/natoremasasirerubepege.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/35287516566.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/segupu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/23d6966bdc539ffee9f0f4c5671799dd/34936075679.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/14856426795.pdfIn PDF document text
    • http://vina2002.com/uploads/files/fanekusaxanajaragex.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/60467413228.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/56568779061.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/bazubozafewuruninaxeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=night+mode+in+redmi+9+primePDF 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_off0000dec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 17388 bytes
SHA-256: 319e3faf163f88ec2fdabb596a5fa8cba065d744c09de2bf45f0794ebc7e298a
font_02_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 10608 bytes
SHA-256: 4c1ef740a96930daed401174b44d213b3ed0da90e1909fd99047e910591e42fc