Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0d4d736af567e8…

MALICIOUS

PDF

80.2 KB Created: 2021-03-29 10:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 345a93dcbed6325a3224c2eb457d048a SHA-1: dfe1e2625d755742727a652f5c1c3b7bdeba8ea0 SHA-256: ab0d4d736af567e875c15a117d83cd23e6fff7dc0b7084a9a5a41e2440dd1294
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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://druttle.ru/wix?keyword=star+wars+cake+toppers+edible PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408878/normal_600a4322d5f64.pdfIn PDF document text
    • http://tiktoktop.design/fagokujapewedapetine7d923.pdfIn PDF document text
    • http://lovechat24.club/workshop_attendance_register_templateiw014.pdfIn PDF document text
    • http://zodazaze.22web.org/rujevepexepi.pdfIn PDF document text
    • http://hookup153.site/30278080733c4w8s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426699/normal_60450c42ea834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_60187af7cb36d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_605544a8166fb.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/jedobufudajewu/pozoduxizogobufejakas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36cea29c-239d-4e33-b339-06c71e3835ac/who_voices_uniqua_on_the_backyardigans.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_73e3b06750074c0d95df32edd4aa1738.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusori/xawarimubulix.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/debepuf.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/66260524404.pdfIn PDF document text
    • http://xumolax.rf.gd/fufabopepumamanivulapaz.pdfIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_9112845c72f64c1988d20b391224bc5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51fde55c-df4a-4d3d-ac22-d395fb2cd894/gelekotobulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa387f00-25b3-41d8-a4ad-9f12c316d881/html_and_css_books_for_beginners.pdfIn PDF document text
    • http://tipesirufig.epizy.com/83565122252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f39979-e6df-4031-8608-c5d63d20924e/rinnai_gas_heater_for_sale_melbourne.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_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 5468 bytes
SHA-256: 52064b93a84d8567f1e82e98f58a7782db4c65481a3d3fef74e717c7ddcf1fa2
font_01_sfnt_off000109d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 11792 bytes
SHA-256: 7e5c3f88e57ab45bd5eb5b518f4e142e891eaab49303765cb2261acbea276e16

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