Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b65efe61fac405f…

MALICIOUS

PDF

81.0 KB Created: 2020-12-15 00:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecb2963bbcf82ab0294c07281c309313 SHA-1: 1f5130aef7a3be3f09c71f3ee62c6bcdede762bb SHA-256: 0b65efe61fac405fa3591aa51412536d6c7da0d43de68fb4965228d291a9ca2a
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical finding for a link farm and a high ML score. The embedded URLs suggest an attempt to direct users to external sites, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://traffine.ru/123?utm_term=perverted+unicorn+jokes
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5fabea4fd5f44.pdf
    • https://cdn-cms.f-static.net/uploads/4405437/normal_5fb436c53e68d.pdf
    • https://static.s123-cdn-static.com/uploads/4386834/normal_5fc56aa165665.pdf
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/niravubiletejoseveg.pdf
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f8ee209e2733.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jivagajamav/61795770705.pdf
    • https://s3.amazonaws.com/pisedij/guardian_game_ps4.pdf
    • https://s3.amazonaws.com/liguwubore/motulubotamafevuge.pdf
    • https://uploads.strikinglycdn.com/files/c410cb09-c809-4372-b282-d4753f1cc0c1/daoist_nei_gong_damo_mitchell.pdf
    • https://uploads.strikinglycdn.com/files/0f205fcd-aacd-407e-b59e-3c2f014468b9/83824537146.pdf
    • https://s3.amazonaws.com/tekujel/konupaxidozuvabekoxavode.pdf
    • https://s3.amazonaws.com/gulapore/home_maintenance_excel_template.pdf
    • https://s3.amazonaws.com/remuv/bumarexegerogew.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d060.bin
3e6b241369cda5c235a8a0dd7ad02eb194677174bd2b6757022ee1e4b0f09307		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 7312 bytes
font_01_sfnt_off0000e984.bin
7c9aa6daf03e9201b9cd08851fcc652afa5a29dce8901406846161626e41f927		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 4892 bytes
font_02_sfnt_off0000fa46.bin
4078ff160cadeb161f1b2fcd5c588062943bdac6e69bf04ada836abce193099c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 11792 bytes
font_03_sfnt_off000121c2.bin
f0f083194428ae24bb9ec42a4e1ff5b0d6cf87215180a1b4af466dc9842c6c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 16064 bytes

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