Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7c4244913f350b…

MALICIOUS

PDF

75.4 KB Created: 2021-03-16 00:19:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4ac8e1e383121f2aef008edf3f6542d2 SHA-1: 216fafb818eadc514c3c6fc9279fea985a176805 SHA-256: ae7c4244913f350b72a888472d4d50131a481413b10ea04bfc106fa604f7067f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=than+vs+then+worksheet+pdf PDF link annotation
    • https://zezodejesamibiz.weebly.com/uploads/1/3/1/1/131164097/8a8b5161ee4d70.pdfIn PDF document text
    • https://cdn.sqhk.co/worekoxe/hTiehHg/67069723091.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/jerwcia/english_love_stories_to_read.pdfIn PDF document text
    • https://cdn.sqhk.co/nojumuku/hhM0gjG/game_i_m_ping_pong_king.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/igewXpR/68879208170.pdfIn PDF document text
    • https://xorigikaku.weebly.com/uploads/1/3/1/1/131164164/f3a1f13d9c.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/ajfievz/best_tuner_for_2011_6._7_powerstroke_forum.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/ahiajjc/vegiweberajotoretowatu.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/hg9Fic5/16800167504.pdfIn PDF document text
    • https://rapodiduwegez.weebly.com/uploads/1/3/5/3/135311990/7837788.pdfIn PDF document text
    • https://cdn.sqhk.co/gepaxulunan/ekjf3iC/cupcake_cake_template.pdfIn PDF document text
    • https://noresewikikizi.weebly.com/uploads/1/3/1/4/131453465/ea8402.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirorip/Cwhgxgh/justin_herbert_scouting_report.pdfIn PDF document text
    • https://rofupujo.weebly.com/uploads/1/3/4/3/134335987/wadamezexuji_kofudovaxijivag.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/aiegdgi/applock_pro_apk_2._8._10.pdfIn PDF document text
    • https://cdn.sqhk.co/bejamisokepu/xhbmric/28036501902.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_e03df81dc06f4e7d8e224aeee5d38138.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_ecd13967f2e14cc5bde63102ddc187c7.pdf?index=trueIn PDF document text
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_258fafe04a8440f29e9d368f8bab90ee.pdf?index=trueIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_8abc4e15fff64506aa231b8478628d3f.pdf?index=trueIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_25bcd7cc72b24b9fbe073c177e7b217b.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_90c4d3ae191a430cb19ff460bab357e8.pdf?index=trueIn 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_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 5264 bytes
SHA-256: b5da30fbc589c4df9c7c5ddcf80fa477fa9f915550abbce8901d13fd88ee9960
font_01_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 10376 bytes
SHA-256: eb808104490709e4de5b41d4ad0dfc4fe0d11b1de1650f406943896b69b0d0cd