Malicious PDF — malware analysis report

Static analysis result for SHA-256 c522c4bb49930ea5…

MALICIOUS

PDF

69.8 KB Created: 2021-05-28 02:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5eb73fa8f4b10efa13feed2e9e9c36ea SHA-1: af6581d82b2758742a7b2696d89bca1fa0357517 SHA-256: c522c4bb49930ea5cbe53eebbf79c655ed7672dc4724f6b412f0c97b3050ad3c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to PDF files hosted on link farms, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=transforming+exponential+functions+worksheet+pdf PDF link annotation
    • https://xagajanum.weebly.com/uploads/1/3/4/5/134599721/pobupepozedexel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_604f7427e602a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413346/normal_5ff25ffa4ac99.pdfIn PDF document text
    • https://zitipijasidigor.weebly.com/uploads/1/3/0/8/130874434/fopamuzej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366633/normal_5fce79e91e674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_60345b6f22ea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_604ad644420d2.pdfIn PDF document text
    • https://gijosugomigul.weebly.com/uploads/1/3/4/3/134317853/lekos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_603b11b61eb40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_601e2d3f0bd91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454432/normal_6065509175bd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382423/normal_5fe8aadd7b5d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474218/normal_5fcff2865f1bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_606d7ebb4f168.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374957/normal_5ff8b223149e9.pdfIn PDF document text
    • https://xirugavo.weebly.com/uploads/1/3/4/3/134337246/delisofu_gorunevoka_bemegaw_misupulo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8588f7bd-52e4-4447-8331-5a1e207d87d6/botanica_sistematica_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee8ca83-7742-4fcd-aba6-37306508e7c7/94982553882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8653005-4591-4286-b90f-fcc02aa15062/how_does_stimulus_check_appear_on_bank_statement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67eccd42-88d4-4d6e-913d-2cae7af898be/can_i_use_python_for_machine_learning.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_off0000d1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EC 5744 bytes
SHA-256: b4e60226c22dc4fec88b2eafa8f060e391d620d49508ff26c7795a4ef5faf1d1
font_01_sfnt_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 10100 bytes
SHA-256: d8e38405a6f5250c4d18fc61705e737fc6637d4c8ab03bc4018ee521db0371cf

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