Malicious PDF — malware analysis report

Static analysis result for SHA-256 b983e1d7ee9dd164…

MALICIOUS

PDF

80.1 KB Created: 2021-04-18 14:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92bf784bf02f2ad1808cc3887b87625e SHA-1: a6410095c227733f03b4287edafc945d13a29d2b SHA-256: b983e1d7ee9dd16404c74ceae52acc884ae9b03accfd683c6c8d71feddc905c7
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing attempt. It contains a large number of external links, many of which point to other PDF documents, suggesting a link farm or a method to obscure malicious destinations. The primary malicious URL identified is https://jacksth.ru/strik, which is likely used to redirect the user to a phishing site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=what+is+resistor+color+code
    • https://static.s123-cdn-static.com/uploads/4421207/normal_5ffaf1a1e2c81.pdf
    • http://magnitoli-2ekran.site/tx_4.9_sportcraft_treadmill_error_3fmwbw.pdf
    • http://tamodemuror.getenjoyment.net/tuvozata.pdf
    • http://wonder-ita.fun/lorelofaniziberamezapuw51sy6.pdf
    • https://cdn-cms.f-static.net/uploads/4413243/normal_6064be50505f7.pdf
    • https://fisikovomit.weebly.com/uploads/1/3/4/6/134652659/xuzowewitemivi.pdf
    • https://static.s123-cdn-static.com/uploads/4416806/normal_5fe5b6a320b50.pdf
    • https://static.s123-cdn-static.com/uploads/4414869/normal_60028a136fd75.pdf
    • http://pipvip.ru/sears_coldspot_freezer_manualqjyt7.pdf
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/pogaz.pdf
    • http://goossyy.online/66893501703t2pyn.pdf
    • https://cdn-cms.f-static.net/uploads/4369191/normal_60362a54834e7.pdf
    • https://cdn-cms.f-static.net/uploads/4485309/normal_6025c4d6cc0d9.pdf
    • http://gachihyper.xyz/maytag_neptune_dc_dryer_manualvqdfa.pdf
    • https://pebarefilegiz.weebly.com/uploads/1/3/5/3/135325086/xifusuxena_bonedonagorured_putenuvoged_pipigubitesar.pdf
    • https://static.s123-cdn-static.com/uploads/4367279/normal_5ffe85bbd84c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_1d4b4263022b4e0886bd7be31e67aea4.pdf?index=true
    • http://jezevenakos.myartsonline.com/83903748579.pdf
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_654aeac7432d48c6a1f641b8a6f1e4a4.pdf?index=true
    • https://b2691e05-be35-46d2-a26d-08c503de0475.filesusr.com/ugd/b15c0b_1ae649da394644eea3847b68a4f79ccb.pdf?index=true
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_84723cd0bf1948ee94492948e70a44aa.pdf?index=true
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_69db6ac505bd4ad3b7ec6a742e89b699.pdf?index=true
    • 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_off0000fad0.bin
c8152c9cf5729a6c6564c812e4f99297782c8e01c02fd8d88685deceb8f5ba32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 5040 bytes
font_01_sfnt_off00010bf5.bin
3461415886dafb39b9b4b2233b2d12f8ae144c665fbbdf11676c7c3fbc870e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 11108 bytes

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