Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8eca1209133b21…

MALICIOUS

PDF

75.5 KB Created: 2020-12-23 08:02:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8dbba4dc41aacc9dc61c65d87fc0cf0 SHA-1: d4cbf99e7351fc8fe15653be4307dc6345c983d8 SHA-256: 3b8eca1209133b2119a18abb789701037dcaf94448d1c9d427a5b4682c7a5a61
214 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's designed for phishing or malicious redirection. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain keywords related to search terms, suggesting a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://gettraff.ru/strik?utm_term=tiger+shroff+songs+new
    • https://cdn-cms.f-static.net/uploads/4404733/normal_5fa3c2d0be36e.pdf
    • https://cdn-cms.f-static.net/uploads/4472764/normal_5fa8f637379fa.pdf
    • https://static.s123-cdn-static.com/uploads/4376096/normal_5fc3e42980771.pdf
    • https://cdn-cms.f-static.net/uploads/4384155/normal_5f92a95d4f8c4.pdf
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/593160.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b049d068-83f7-4146-a9d1-18d0a67428cc/nuvegigav.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4ddc3c6ccf69f354dec2/1606372830740/wekixo.pdf
    • https://uploads.strikinglycdn.com/files/3cbe76d8-de0e-4ef7-9186-f4bb3d18e1a6/wigimiwume.pdf
    • https://uploads.strikinglycdn.com/files/133f88bf-b6a8-46d4-8f77-00262b8d9161/38059395001.pdf
    • https://uploads.strikinglycdn.com/files/d200b40c-12f2-422e-bf67-975aac8a47b7/eagles_football_logo_clip_art.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3e0.bin
12ccf4d14a6cd4f53e7adde2e5443f6ab0814cd540af4bf40f33b83ffae40398		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E0 4828 bytes
font_01_sfnt_off0000d45c.bin
fa98316bad0ee393e4244be63b1d230beb4724cf855be96ad4f2c87a5b302ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 2140 bytes
font_02_sfnt_off0000de36.bin
5583cbb5132c174e178f30d83dbb2bf4aece2a217cee87f5c27743bdd105aa5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 11508 bytes
font_03_sfnt_off00010453.bin
794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10453 16168 bytes
font_04_sfnt_off00011948.bin
74be5bc4d46f64e5c506ae1006f7022dc98ebf960e37c7bf417c2027ca73106d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 1736 bytes

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