Malicious PDF — malware analysis report

Static analysis result for SHA-256 d670dd5e94ea7841…

MALICIOUS

PDF

87.9 KB Created: 2021-03-28 09:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fb1f6204372362e4715ce37add9f771 SHA-1: 6c2eee57954c0ecd009353edcc7a9c113fde4aa1 SHA-256: d670dd5e94ea7841965cf7853a43cf91dfa35a211ae2a2771fddb0669117c5f8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The primary malicious URL identified is https://golowaki.ru/wix?keyword=jam+ultra+true+wireless+earbuds+manual, which is likely used for phishing or to serve a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wix?keyword=jam+ultra+true+wireless+earbuds+manual
    • http://thecet.xyz/83151542192zduzn.pdf
    • http://sanatoriy-izumrudny.ru/what_does_the_number_802_mean_in_numerology0pqa3.pdf
    • http://burivuvuju.medianewsonline.com/principles_of_agricultural_economics_in_telugu.pdf
    • http://jarevine.mywebcommunity.org/16310049540.pdf
    • http://wawesoja.sportsontheweb.net/ruvaboluwidijurepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_76262051860d4513911dcf784eca1edc.pdf?index=true
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_c691183c8b014998ad5cfd87fbac1898.pdf?index=true
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_e16f73a5018c4ba19014c266e5ca6098.pdf?index=true
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_340adbd9e6eb4aac8ff3b8c059ec31b4.pdf?index=true
    • https://s3.amazonaws.com/tizowodifi/the_historical_novel_lukacs.pdf
    • https://29bb9f0a-cb36-4278-8b1c-05d86a2267e4.filesusr.com/ugd/25e746_c7df18ed051c46d39569521dbae3bd44.pdf?index=true
    • https://s3.amazonaws.com/zikeko/gewezutumevuwitarozofit.pdf
    • https://s3.amazonaws.com/kagedatabujo/16211826655.pdf
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_d5b8636824ff4b1a93fe2746a6c48016.pdf?index=true
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_d704d5fa47f24b6bb806c0732cae0d37.pdf?index=true
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_40477e99c2db4c619b02a704386ddf3f.pdf?index=true
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_fce71e14bbc244eb820af4ddf83c5930.pdf?index=true
    • https://s3.amazonaws.com/vososasoxumete/srimad_bhagavatam_moolam_sanskrit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109ca.bin
4c688c0676da4c9c3f1d636d29496b85ed1f90b4285ee9b780884cc7de0e34ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 2960 bytes
font_01_sfnt_off0001143a.bin
7b80fb3313752ce466abdba9b15d9b2fc089fd5d43cdf60d2309e500eaf5ee2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1143A 5192 bytes
font_02_sfnt_off000125da.bin
2aba30626897d161c135688cbdadc8f8f7e589c20680c6ddbcbe6657ca6fddb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 14128 bytes

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