Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cd6182409ef046…

MALICIOUS

PDF

76.2 KB Created: 2021-10-11 21:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6fdf1c596ac114661f0cc8263d4d9109 SHA-1: ed9503a1b223c11fa7c494aa90d53a19b2fb0590 SHA-256: 24cd6182409ef04605863c9a30eaaf000fcb63f38273c0a7bd3580d4542c9192
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one specifically identified as part of a link farm on disposable hosting. The PDF's structure and embedded links suggest it is intended to redirect users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=the+dark+prophecy+read+online+free PDF link annotation
    • https://millvalley.com/wysiwygfiles/file/13597514779.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a019713cc---18048501032.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/51190679345.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/5530990434.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/nagojoloxaj.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/vobage.pdfIn PDF document text
    • https://cronos.jptecnicascr.com/yiicms/ckfinder/userfiles/files/wolekawel.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/vojurovupon.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/91196174977.pdfIn PDF document text
    • http://gibisch.org/files/files/numirumakexipasuzisofu.pdfIn PDF document text
    • https://e2imgu.ratnatelenet.com/UserFiles/file/mowopomodi.pdfIn PDF document text
    • http://djpress.pl/Image/files/72295448494.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/rujapazinowitotutirozeto.pdfIn PDF document text
    • http://snft.ro/media/file/1142886499.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/koxisen.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/fudurovenizobamajix.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sofuvutadupinike.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/weriwiwero.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/25815934850.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/volatajedijanalalu.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/7502169612.pdfIn PDF document text
    • http://kant21.com/userData/board/file/83834761209.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/borox.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/bibibaba.pdfIn PDF document text
    • 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_off0000c649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC649 17328 bytes
SHA-256: 22fdd7c4805ff2348518c08a1914c5b765271ab7279084da6c66abb8705db3ec
font_01_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 10620 bytes
SHA-256: 725692f830dcd186913d73f3eff6769350e19f44365d593b187f2f48342055f9
font_02_sfnt_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1