Malicious PDF — malware analysis report

Static analysis result for SHA-256 984c336ec873f6b5…

MALICIOUS

PDF

82.7 KB Created: 2021-09-23 23:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d585e92d89b6117c340a013b3b85603d SHA-1: c67bd125a8b7a3775f9b4e941ec104e8a39bea73 SHA-256: 984c336ec873f6b5658fa83d69a61f692c018cdc81c742fc35eb05bb4f13a973
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, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate effort to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://kermoulin.com/userfiles/file/371965964.pdf In PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/munanumatilenufad.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/majesafijatolo.pdfIn PDF document text
    • http://szjg.hu/images/file/493287858.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/kefuloridozasi.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/sotovigamusavobebigopati.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/pegew.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210922035854567.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/3e6ccb6b054e1e68107f5cf143698267/7225275697.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/edb5dace43890f2577f5edf1348cf65c/20752778859.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/fisujobanokagibilanujage.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/43939825571.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/43814556817.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/67703688817.pdfIn PDF document text
    • http://waypl.pl/upload/File/23219135957.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/65125212107.pdfIn PDF document text
    • https://agatanorek.com/files/file/54491987817.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/20972380546.pdfIn PDF document text
    • http://1111.morefriendship.com/upload/files/todumadunup.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/vozezigidevikivat.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210906_4C5BFA18330CB8E0.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/sixojagazadusotadok.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/10545467753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=unlimited+gold+candy+crush+sagaPDF 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_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 17640 bytes
SHA-256: d1b87352e62c72669310d73ea98b357e57ecaf0432af019183c263c7c2f8da20
font_01_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 11036 bytes
SHA-256: b717650caf7bf820a1ac83bb90a829183cf3081d9de28428a550581337ed6b14