Malicious PDF — malware analysis report

Static analysis result for SHA-256 25488d88e0b8f716…

MALICIOUS

PDF

77.4 KB Created: 2021-03-13 14:29:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c4cfbb4d64b0a41082896ef396804522 SHA-1: 3b6f581f760a839cc439624451a5f6cd033e5fb2 SHA-256: 25488d88e0b8f7165c2e120bd28163e58be672c78ec14843f9b20f0c9a630941
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, with a critical heuristic identifying it as a PDF link farm. One of the embedded URLs, https://botokaw.ru/strik?utm_term=how+many+types+of+natural+fibres+are+there, is particularly suspicious and likely serves as a lure or phishing entry point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://botokaw.ru/strik?utm_term=how+many+types+of+natural+fibres+are+there PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370778/normal_6032476a472ba.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/48366199473.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403407/normal_5fcb3238d9f1c.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/90459138401.pdfIn PDF document text
    • https://cdn.sqhk.co/munenetifu/dcjeief/67062405044.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/guzedosezil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529149/normal_5fed40254f96e.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/i5ShcQn/zanawefanonipo.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/vemosa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fekife/math-worksheet.org_geometry_assignment_answers.pdfIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_6763708ee323485db564241aabee6401.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/board_game_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/baldwin_county_schools_report_card.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_6ddb0164e81245b7995f87c357a8336c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xojafemori/resuscitation_guidelines_in_australia_are_provided_by.pdfIn PDF document text
    • http://rixigor.onlinewebshop.net/aashto_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/businessman_movie_telugu_hd.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_ebdc021473664ef088c987a450d1d658.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miledu/91771382816.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/algebra_word_problems_worksheets_year_6.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_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 5436 bytes
SHA-256: 054a973b2b8d8b76ff673878a5627131b4d69a60b3b6c3767d0862e0f4178717
font_01_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 10848 bytes
SHA-256: cfc549df5f7534e237b1aa724bdffcdb63dea97a39d38725412a4cdd52f9c1b4

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