Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21fe53df845450a…

MALICIOUS

PDF

79.8 KB Created: 2021-04-06 18:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd71d050694740649b32f1fae916a917 SHA-1: 9efd7d52f5e5a7c73a0ad23a2150f34ada4cf8ba SHA-256: b21fe53df845450af0d8da55962c5b7d3af36d81e84f6f4798117fd547dc7823
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malicious link farm, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the numerous external URLs. The file's purpose appears to be directing users to potentially harmful websites under the guise of providing a manual. While no scripts were directly extracted, the structure and numerous links suggest an attempt to exploit users through deceptive content, aligning with spearphishing tactics.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=portland+1750+psi+pressure+washer+manual
    • https://cdn.sqhk.co/kajurineg/xcjb8ha/20952127100.pdf
    • https://cdn.sqhk.co/dorodidur/vdt4jb1/edge_lighting_samsung.pdf
    • https://cdn.sqhk.co/dulidara/Prjbhim/happier_music_video_ed_sheeran.pdf
    • http://latozon.iblogger.org/jijevevavu.pdf
    • https://cdn.sqhk.co/xuvisisitinu/ijQVYp3/beamforming_5g_antenna.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_cfba0f28ad30453c99996cad19b01ac9.pdf?index=true
    • https://801a9f91-e12c-4b3a-b535-42c3eaff61c8.filesusr.com/ugd/d237ef_a2f6313a17a6495ab704b842ee23711f.pdf?index=true
    • http://gafevudivexer.rf.gd/is_there_a_series_2_of_little_fires_everywhere.pdf
    • https://s3.amazonaws.com/vekodupiwarobi/canon_eos_rebel_t5_manual_espaol.pdf
    • https://s3.amazonaws.com/povodijirig/158451652.pdf
    • https://s3.amazonaws.com/nimuwet/mixture_problems_worksheet_algebra.pdf
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_d152c5ade9714476bbf04932cf471703.pdf?index=true
    • http://xorisok.epizy.com/69457192501.pdf
    • https://f0ef5849-56f4-4665-9409-a4e47f47d862.filesusr.com/ugd/205ae4_99e526d875f84544a45893560931ff34.pdf?index=true
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_b996c5f9d5314249ab089b78e561a8d0.pdf?index=true
    • https://s3.amazonaws.com/rijaliwiguvex/gakapilitebiv.pdf
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_3cfc2009f5ee4f10a34ef903f595804c.pdf?index=true
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_c48d541ab0fe4d5381c42e8e84c34840.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_off0000f905.bin
1eafd986388ef8771f99187ee9b44742c06add2715c1d310811c51cc6932a20a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 5688 bytes
font_01_sfnt_off00010c52.bin
7eee56a42a79fb6e11d17df42fa32d5fbc231664901eab3c078860a12e7ff66a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 11380 bytes

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