Malicious PDF — malware analysis report

Static analysis result for SHA-256 30dfbc3472601c9b…

MALICIOUS

PDF

89.7 KB Created: 2021-02-16 21:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: edd2d3c6548751c160ae5bd20f1083a5 SHA-1: cb97c54c0842d32f34322ca8194a2f37bfda9a65 SHA-256: 30dfbc3472601c9bcb7be8aa24747b541f477c01236549b9520f8224009ef114
156 Risk Score

Malware Insights

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

The file is a PDF that contains a heuristic firing for a link farm and an embedded URI pointing to 'https://jacksth.ru/wix?keyword=crazy+love+book+pdf'. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The document body, though truncated and obfuscated, contains text related to the URL's keyword, suggesting a lure. The presence of external links and the phishing detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jacksth.ru/wix?keyword=crazy+love+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371791/normal_5ffb29a4dbdeb.pdfIn PDF document text
    • https://lejegibovijidup.weebly.com/uploads/1/3/1/4/131438293/kunopig-luzorefigexer-vugabiv-lukafunesiwet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416319/normal_5fdfcf0ce9340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373770/normal_5fed953120718.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481852/normal_5ffc8783055a9.pdfIn PDF document text
    • https://kisezuxuromo.weebly.com/uploads/1/3/0/7/130776201/625541.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/xugovodixiv.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/folosesunejas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fizaxo/falamusafitig.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/encontrar_mi_android_por_cuenta_google.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/lead_lag_compensator_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/crystal_reports_case_statement_in_record_selection.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/92579544484.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/chapter_2_assessment_economics_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/haute_magie_kabbalistique.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/can_you_build_mass_with_bodyweight.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/32512824312.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/python_3._7_64_bit_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001183f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183F 4852 bytes
SHA-256: 4fb662a1888125b4be8ecf5a35fb343c421cf23cf3f2bb2eff983a567069df71
font_01_sfnt_off000128ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EC 10172 bytes
SHA-256: 231675a83f2cf66826a731b8d5984d2299c270e09bb8b5b2f245fe6e493ef0e4
font_02_sfnt_off00014bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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