Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba07d99cef40f1b5…

MALICIOUS

PDF

75.7 KB Created: 2021-03-31 23:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 45eae27101e1d2171c87c8cd7b39bcad SHA-1: 58ab6c27e2983726cfffc880ce025acc33a751f8 SHA-256: ba07d99cef40f1b547b144850c2263024d83f2e73f161d988eb7342704738fa3
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 0.9998

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://xezojetit.ru/award?keyword=becoming+a+supple+leopard+2nd+pdf PDF link annotation
    • https://nuluziberalisox.weebly.com/uploads/1/3/1/3/131379655/8e1ac.pdfIn PDF document text
    • https://kuzeloxowew.weebly.com/uploads/1/3/4/3/134330257/9074040.pdfIn PDF document text
    • http://twoup-viktoria.online/50025502191y9bo8.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/fusanopaso.pdfIn PDF document text
    • http://zesizejo.22web.org/zifegifiwuxolonenar.pdfIn PDF document text
    • http://neyroskakalka.site/312832967148qwnw.pdfIn PDF document text
    • http://tuzojexis.mypressonline.com/politik_identitas_pemilu_2020.pdfIn PDF document text
    • http://gvidilon.ru/how_to_draw_step_by_step_for_beginnersnkw66.pdfIn PDF document text
    • https://diwekivoveludu.weebly.com/uploads/1/3/5/3/135313391/516d6e8735db.pdfIn PDF document text
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/e2934e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rowoniwetob.atwebpages.com/libro_del_seor_de_las_moscas_completo.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/79079609851.pdfIn PDF document text
    • http://juzapurul.onlinewebshop.net/67642349328.pdfIn PDF document text
    • http://bekepijamewevo.epizy.com/dividing_polynomials_word_problems_worksheet.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_31ab1d04819a49d5acbfc6f302d61549.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kabisebax/21322986116.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_556c4e88996640699d416f2fd27134ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisoxow/96938756296.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/ars_notoria_game.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_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 5656 bytes
SHA-256: 8f2fdd745fc5badcfbd7dd8c91cd0ffb5566d4d5ca293b13398ecf1011ab2caf
font_01_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 10916 bytes
SHA-256: 04b739d9593e44793b3711ffa3149bc9db0d645224c22798cadd143ecd1f13b0

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