Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36ffb5da14316c0…

MALICIOUS

PDF

77.2 KB Created: 2021-09-16 03:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a8d8675326b95e50621e10e28b8c1d7 SHA-1: 9ecf479898701933201d9b9a0ba054f6b3ea7a9c SHA-256: e36ffb5da14316c0bc310315dd3f13b53bd738f3e7996bb0a683cc7c3f8e8698
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable domains, indicating a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of unknown reputation URLs strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

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 http://tlxzkj.com/uploads/file/160121057549.pdf In PDF document text
    • http://lidaoxc.com/upload/files/daloxubajuvuzedibi.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/xuzapa.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fm72vrukfor03t7i7o840cbrr6/fuzunuguxef.pdfIn PDF document text
    • http://dd-eng.com/files/files/jajidiful.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/xilebevezikogemolebiso.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/xoritapanezaw.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/16564760539.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/98037641363.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/zututeberavovokopi.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/21715139547.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da9fd9a8ab---kolewezu.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/84607194344.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/79724374374.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/vavonev.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/sorib.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/rozonulafodux.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/nafewokalom.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/jovevewugub.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/sevatef.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/71585712614.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/91058981240.pdfIn PDF document text
    • http://climtech.com/files/files/83323073029.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/1559329961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=king+root+2019PDF 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_off0000ca79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 17604 bytes
SHA-256: de09a572c365a3ee217679ae9440e021de1b0596db091126cbe3e3849a1568b1
font_01_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001105e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 10228 bytes
SHA-256: f7ee9ef6d856c45f471930717689126e3ee5dd8fc5a4084759baf2a3f824c623

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