Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8dbe9997a93b53b…

MALICIOUS

PDF

73.1 KB Created: 2020-12-01 07:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce9e32dea2da2226472ae0fb865750b1 SHA-1: 12841b2e1efce1f44c0f44304d0ea6f9093092bd SHA-256: e8dbe9997a93b53b9786ed1b23ea367af79a0710cb0ab64a97509b7a340e65b5
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link. Another critical heuristic indicates a PDF link farm, suggesting an attempt to distribute or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=ecce+romani+workbook+pdf
    • https://disinuxokisukoz.weebly.com/uploads/1/3/4/6/134610262/lewixijisagejin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/11e31679-8b8a-404a-a07b-f96c04519236/2221813083.pdf
    • https://uploads.strikinglycdn.com/files/977da8c7-b8ca-43e9-8d84-cc26495de53a/titupududenoreniwod.pdf
    • https://uploads.strikinglycdn.com/files/f8d0cab1-693e-4cf4-b8a4-15f68ac522a7/6412592812.pdf
    • https://uploads.strikinglycdn.com/files/4b07df55-4f32-4395-8fe9-57dd14d8f3d8/90236988574.pdf
    • https://uploads.strikinglycdn.com/files/bb86e99b-0804-4f09-bacc-3b2dfdcf228e/ac_odyssey_best_mastery_levels.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4f7d9d7936484084ad40/1606373245949/zofiru.pdf
    • https://uploads.strikinglycdn.com/files/efa14e03-41a8-4b16-952b-90cbbab58e93/68746734182.pdf
    • https://uploads.strikinglycdn.com/files/112e4a3b-fb35-4be3-b393-18925718cb18/army_mos_31c.pdf
    • https://uploads.strikinglycdn.com/files/2a6b0932-c762-4a3e-aa9b-8004075e5903/posiwegavosugivevazalu.pdf
    • https://static1.squarespace.com/static/5fc1343bd26ff1194f75a191/t/5fc55b089d79364840402508/1606769417942/nordictrack_audiostrider_990_specs.pdf
    • https://uploads.strikinglycdn.com/files/583c3fc3-40bb-491a-b079-c41c3fec6450/greenhorn_bass_tour.pdf
    • https://static1.squarespace.com/static/5fc1012fe5c7695ca99c31f6/t/5fc16d7ef8cdb769c619621e/1606512005677/jirurodulas.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1cd.bin
a38e3563c04b5271c9119e8a489df929768f11d0112749c76d15ab1a9df83c16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 5344 bytes
font_01_sfnt_off0000f3fa.bin
66e44c828b7b9c45dcfa331671bb046f88a66fb7a357b4493e0a343967657d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 10360 bytes

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