Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a6e6fc58cf2bc7…

MALICIOUS

PDF

72.1 KB Created: 2021-03-19 11:29:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 21ecd8b752514ea48a0591a0ef3a28b8 SHA-1: c13045ffe4fa5e0eaebdf165c8b84cb0983e55f4 SHA-256: 96a6e6fc58cf2bc7c40b514d2b901713de0cf7fbe9811e57bc30880a44a0fc32
206 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The malformed stream length heuristic further supports the presence of exploit code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ponafet.ru/award?keyword=oxford+english+for+cambridge+primary+1+pdf PDF link annotation
    • https://vutuzanepe.weebly.com/uploads/1/3/1/4/131453188/3059774.pdfIn PDF document text
    • http://veronaital.space/73629234934pzaw2.pdfIn PDF document text
    • http://detonic-official.website/6868553484j5u04.pdfIn PDF document text
    • http://termometr-medikal.site/lamawokububefajipugikowzsngt.pdfIn PDF document text
    • http://hugertely.xyz/adobe_sketch_draw_apk0t0g6.pdfIn PDF document text
    • https://sozagigojo.weebly.com/uploads/1/3/1/4/131454883/fce55e78d.pdfIn PDF document text
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/bazodadajapanuka.pdfIn PDF document text
    • http://helpcopyright-service.com/messages_for_web_samsung_s9w8a77.pdfIn PDF document text
    • http://sewonmedix.ru/how_much_does_it_cost_to_fix_a_6.0_powerstrokej7l80.pdfIn PDF document text
    • http://reduslim-italia.website/37609490872w8du2.pdfIn PDF document text
    • http://tcerkovniekupola.space/food_dudes_kitchen1xr3p.pdfIn PDF document text
    • http://indohealth365.online/kosixuvoged2rfj3.pdfIn PDF document text
    • http://smartcoin.design/zusixubuvamijqp6dt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_f3d4c756cc9d4b71aa9f27e4d7192059.pdf?index=trueIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_855396421cc249fdb20c5909143fe005.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5842565-8b2f-4c3e-855a-f5d876d273df/97639504406.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_5e9849b9e46b43859bef9865eccb6024.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdcc0868-866c-4c41-a346-cd4a3127ccca/85840341277.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/32669756404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/683535ba-e730-4d60-90cc-441e9bb87cc2/john_deere_7000_planter_plates_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/free_6th_grade_math_measurement_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee55f230-c3cd-4b39-bd05-fe51a4402061/judone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/781b1525-cee7-4a1a-aa97-5c4839712593/bibalisegag.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_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 5956 bytes
SHA-256: 2a396035c794d574741d013e3cf60f1fde91ec470558f3d0bf98e436a5ca8ab5
font_01_sfnt_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 10860 bytes
SHA-256: 20629703739e0f55f7661321089848908d8859fcab426fe4fed87a309968a6e0