Malicious PDF — malware analysis report

Static analysis result for SHA-256 8688514770c52d60…

MALICIOUS

PDF

70.2 KB Created: 2020-11-13 17:34:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6872a6a1fd4d1a48318066aee77bf380 SHA-1: 5bed246b5242b71da8e9a84aeee478325c3a25d3 SHA-256: 8688514770c52d60bd39863a2b4ac203762a3033c0ec245369e1ce68ec1fb878
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'traffset.ru', which is likely used to redirect the user to a phishing site or download a secondary payload. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a crafted document for a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=would+vs+will+usage PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5f936eeb46688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416318/normal_5faa19b380a5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f878106b43aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454425/normal_5fa9083ed16f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_5fa5c34fa14f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404123/normal_5f9e4f3234cb8.pdfIn PDF document text
    • https://zemexiwum.weebly.com/uploads/1/3/4/3/134330210/zafewinevolobesober.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3e47cf-9478-4f06-ab47-6f13dfa0c179/98417164656.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/watch_series_online_free_streaming_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b3ce98-f0dc-4d55-b13e-afb27b3ea34a/21274434803.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/cordon_umbilical_definicion.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://scripts.sil.org/OFLIn 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_off0000c31f.bin
ffb17e78bd700080cccdfef7b13dae6c894e4c4140fddec1f610ea6ddf801b7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC31F 5060 bytes
font_01_sfnt_off0000d487.bin
dd0c7d310e73553525b055bc02012588577182fbbacd8de352167e74c0ef5349		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD487 10272 bytes
font_02_sfnt_off0000f7ab.bin
9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 16096 bytes

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