Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94e89035edba46d…

MALICIOUS

PDF

76.6 KB Created: 2021-03-13 17:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cd3fee1542571b681145eb74065b0cff SHA-1: 9df60505e0c07105fec526e2d141c4385d2772dc SHA-256: e94e89035edba46d784e4953affebd6b06c189ac076c8ad40c70358fdacc8540
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://leonvi.ru/strik?utm_term=what+are+the+different+types+of+irish+music PDF link annotation
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/tevubozezupozag.pdfIn PDF document text
    • https://kivijakesav.weebly.com/uploads/1/3/2/7/132740669/zamugoxavevu_beduso_joxilo.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/44986550690.pdfIn PDF document text
    • http://kodavuviguwu.mypressonline.com/akshar_publication_computer_books_free_download.pdfIn PDF document text
    • https://ranaxeli.weebly.com/uploads/1/3/4/4/134478161/e1ee7e44fc6bf5.pdfIn PDF document text
    • http://zakofuta.66ghz.com/classifying_matter_worksheet_grade_7.pdfIn PDF document text
    • https://fikenetefi.weebly.com/uploads/1/3/4/7/134771518/jabatodeb_narekegebaze_vabujinu.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/international_journal_of_research_in_marketing_ranking.pdfIn PDF document text
    • http://tinipen.medianewsonline.com/xilejunox.pdfIn PDF document text
    • http://gejopuzebizovuk.iblogger.org/housing_development_board_annual_report.pdfIn PDF document text
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/4200026.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/lidojogepe_deronivoli_xevudixunop_pevebiduj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://javozajesaretu.epizy.com/naforoxunejipekokivu.pdfIn PDF document text
    • http://vexolofifete.atwebpages.com/introduction_to_biotechnology_book_free_download.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_06dc8a3315274c8bb0e964f283822473.pdf?index=trueIn PDF document text
    • http://pofazutufugu.epizy.com/cache_cleaner_super.pdfIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_2fc806d7c49f4e339c300180cd453b5a.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_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 5480 bytes
SHA-256: 89d1506e6ec6f9b861fff39b68e0eb726877b47646dd9dc7de38f115b5d08b2d
font_01_sfnt_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 11464 bytes
SHA-256: 85282fc7b3f0b808319f0d1a3c6933b7b0768dadba14ccf5299e8165d1bdd40f

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