Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab09a5edf43826c…

MALICIOUS

PDF

79.5 KB Created: 2021-03-17 13:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfc88339436340978139ba55f2ec06f2 SHA-1: ec2c1c563cd098c09cdb1c86787d1c2a9ac774f4 SHA-256: 9ab09a5edf43826c3d7e746d418c02b4391a424d40b93d7910a3e16885248e31
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL suggesting a download for a 'CSR racing mod apk'. This, combined with ClamAV detection and ML classification, strongly indicates a phishing or malware distribution attempt. The presence of embedded JavaScript, though not directly analyzed for specific actions, is often used in such documents to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/wix?keyword=csr+racing+mod+apk+highly+compressed
    • http://milanbeachs.space/what_do_i_need_to_renew_my_license_ms5hnd8.pdf
    • https://bigudiwox.weebly.com/uploads/1/3/5/3/135304820/3b3476ebe646c4d.pdf
    • http://bankrot-biznes.ru/rivevubizitnjhj.pdf
    • http://lezigovedavide.getenjoyment.net/sexikokutekasom.pdf
    • http://budofibo.mygamesonline.org/xuxesuro.pdf
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/4576124.pdf
    • https://bonawoxe.weebly.com/uploads/1/3/3/9/133986387/tupon.pdf
    • https://cdn-cms.f-static.net/uploads/4459628/normal_6041f9132daaf.pdf
    • http://medebupima.sportsontheweb.net/new_mary_poppins_chimney_sweep_name.pdf
    • http://kemamibuke.mygamesonline.org/who_invented_the_phone_and_why.pdf
    • https://static.s123-cdn-static.com/uploads/4445573/normal_5febde7c8de16.pdf
    • http://giocodigital.fun/32386756007x0z3p.pdf
    • http://italy50wow.pro/shell_script_loop_through_list_of_filespo6jg.pdf
    • https://moxeguzivega.weebly.com/uploads/1/3/5/9/135965209/sagefelejapoxag.pdf
    • https://cdn-cms.f-static.net/uploads/4454280/normal_602779aca7457.pdf
    • http://shishkin-seed.xyz/best_keyboard_case_for_amazon_fire_10cjfy4.pdf
    • https://loniforuwo.weebly.com/uploads/1/3/4/9/134904684/4885772.pdf
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/732f6abec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_e826920ed4564ab988d73b4a70517817.pdf?index=true
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_5c51c3fc8ead4b259f2c8544986ff8b0.pdf?index=true
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_42c7a1ad1daf4d6f8d3131ced6f11697.pdf?index=true
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_4f077a2eb27f48ae810be17fe4be97c7.pdf?index=true
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_084d1544c06348f5beabed2d7adb07e3.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_off0000f85c.bin
fea3698fb0bf388051ec6cb12457938f379c504b34b961841d8a432a1657f641		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 5556 bytes
font_01_sfnt_off00010b1e.bin
da8101adb9e9739ce7dbd21aa222345673a2b6879acbe7990ed0e90eaa9fd087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 10884 bytes

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