Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e130ff5a0df55c…

MALICIOUS

PDF

68.8 KB Created: 2020-12-18 00:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 38817fba5a571fb588663d05f33b03c7 SHA-1: 1eff7fafb0e2679f4a41e7ccf88aa9fef3006542 SHA-256: 25e130ff5a0df55caf3859fdd69a24c83f268c10a35ecf5f4588fae8441198a8
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-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://trafffe.ru/123?utm_term=world+thinking+day+2019+theme PDF link annotation
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/7633132.pdfIn PDF document text
    • https://lifusapemar.weebly.com/uploads/1/3/4/5/134526201/1529350.pdfIn PDF document text
    • https://vesalitekaso.weebly.com/uploads/1/3/4/3/134314643/lupilapotopowe.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/73440c3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423195/normal_5fcf84a2533e2.pdfIn PDF document text
    • https://zidabowejixu.weebly.com/uploads/1/3/1/1/131163559/6595861.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc27e990a2757459bed0688/t/5fc535813c6ccf69f307d2b8/1606759814463/rakin.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/dafuko.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf575308845d0924817a97/1606375252509/spongebobs_pet_snail_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b56df30-bc39-4d93-843d-9fe9a0d46dcb/57666310197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26129f2e-f09b-4dd6-bc1c-f10e2db90d09/pathfinder_hex_strike_build.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/adestramento_de_ces_de_guarda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb2fab43-d160-44a7-bc89-052627a163bf/92288546447.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/pr_campaign_brief_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/uefa_champions_league_pc_game.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_off0000cdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB8 5720 bytes
SHA-256: a33ae529aa7925f4e5e9f2b8993a517b8e0e82ab10f140df306e45c76310408e
font_01_sfnt_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 11228 bytes
SHA-256: d3270aa72113110dfe6302c8debc2784fe36203f6994db6c34b250c4a30068d2

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