Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c045d049cbe149f…

MALICIOUS

PDF

80.7 KB Created: 2021-02-17 18:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 6bd7b804d7cd3a7315047d70d4192a8b SHA-1: 7cd8c1a1c07d6d3704c40f6830545dc490145acd SHA-256: 8c045d049cbe149f9f22685fb73a217336b85cd39eeb8377eb47a748d5b3e1fa
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDF files hosted on various domains, many of which appear to be disposable. This technique is often used for SEO manipulation or to distribute further malicious content. The presence of multiple external links and the ML detection strongly suggest a malicious purpose.

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://leonvi.ru/wix?keyword=spectrum+fayetteville+channel+guide PDF link annotation
    • https://nebuxulusa.weebly.com/uploads/1/3/5/3/135306634/3255852.pdfIn PDF document text
    • https://vimitorumu.weebly.com/uploads/1/3/0/8/130814921/fdcf78.pdfIn PDF document text
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/lavijid.pdfIn PDF document text
    • https://logomeso.weebly.com/uploads/1/3/1/4/131438572/f540e53c18d93.pdfIn PDF document text
    • https://vubupegizisave.weebly.com/uploads/1/3/5/3/135315261/mawufufijonut.pdfIn PDF document text
    • https://nulodikoz.weebly.com/uploads/1/3/2/7/132740439/xuxatibazixas_sagifokoga_tufebugo_jobebuxafigid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424331/normal_5fddf4a223ce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489593/normal_5fe7304e36ad8.pdfIn PDF document text
    • https://batezumepew.weebly.com/uploads/1/3/4/4/134479003/jikamozubinelik_gasazurud_gejit.pdfIn PDF document text
    • http://wagagawoduzom.iblogger.org/lubimixinuma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vasetirepevomeg.rf.gd/bloc_de_notas_huawei_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/lawewiradezimekemi.pdfIn PDF document text
    • http://gazonenewotife.epizy.com/best_5e_character_sheet_app.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/free_engineering_graph_paper_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/laporan_pendahuluan_fistula_ani.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/59519694300.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_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 5656 bytes
SHA-256: 81819b481cc381f199cc2bdcf1627c9385922b7a52470d5a86c61958b0b63787
font_01_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 15784 bytes
SHA-256: e12d1d7958b152f21f9ee6e041d7e0d127a9513073e79cee2f9e233f0f373a58

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