Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f20b5a8b6504adf…

MALICIOUS

PDF

84.3 KB Created: 2021-03-31 14:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 400c148c732537fd94c81a8460052b3b SHA-1: 128b482ccaac88cb5f0d7cee6cdf9c197f137655 SHA-256: 1f20b5a8b6504adf0fe81bdde85c4b94b8f40d7c8ca3982bb91a97e545a86acb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. Several of these links point to unknown or potentially malicious domains, suggesting an attempt to redirect users to harmful content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/strik?utm_term=personal+development+plan+for+employees+template PDF link annotation
    • http://lunagogafoxoj.sportsontheweb.net/free_download_rslogix_5000_english_software.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/pevukitapegoselekabetiluv.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/calendar_aptitude_tricks.pdfIn PDF document text
    • http://vopezikililurab.mygamesonline.org/sql_database_management_tutorial.pdfIn PDF document text
    • http://gonzo-3d.com/how_to_install_samsung_stormwash_dishwasherkm4ij.pdfIn PDF document text
    • http://skout.tech/618325579988rluz.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/lumoponoramiwiw8jwkh.pdfIn PDF document text
    • http://nesegejisivinu.medianewsonline.com/nokaverekumukobiki.pdfIn PDF document text
    • http://mizafaroremida.getenjoyment.net/enigma_otiliei_carte.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b1c967-73dd-43cc-9c3c-7dd4de68847b/tesuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9600a73-febf-43e2-aa1b-107d49ed8b95/bavabutopugabufezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c4796d-08c3-42ad-978b-1b1868a1b354/99241191529.pdfIn PDF document text
    • http://nitubak.atwebpages.com/65592317330.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/55647013547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9398ab5-7f80-45c3-9a7b-301325e8b83a/34069114299.pdfIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_b94554b07fbe4c1d921e8ecf6b002924.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_035476b53fc34f7d92b2ac5009bf44d8.pdf?index=trueIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_b1c6ada83db34821b33e146726a265a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xefejevife/nafepinilujidibewef.pdfIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_15cfe62cfc264a6fb5d7b3f336a95cbb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/72475767154.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7E 5352 bytes
SHA-256: 48eaa777d62865d36c1818b9a59905901cf2bd537b8a46f7fa9cc27626d9d61a
font_01_sfnt_off00011ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 10796 bytes
SHA-256: 730680d3cc754e2a0659ed4b05d3d6588cd23a08fe3e5f5dc5cb733eb045cf5a