Malicious PDF — malware analysis report

Static analysis result for SHA-256 c882f73e6103e4b1…

MALICIOUS

PDF

67.4 KB Created: 2020-11-24 19:34:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 691cc01de7d35c536fef134c5de9a883 SHA-1: 290343d6ce37240c6f01dc800edcce17f95047ee SHA-256: c882f73e6103e4b153d8e854b888385bc3c6ef95185cbe3164ac2f06ad9a4978
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://trafftec.ru/123?utm_term=microsoft+excel+2010+tutorial+pdf PDF link annotation
    • https://kuxaxamolexude.weebly.com/uploads/1/3/4/8/134869233/89a09eaa1eadbae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f8f038c0cc3f.pdfIn PDF document text
    • https://wivujawa.weebly.com/uploads/1/3/4/5/134582083/gatezegotexisumelu.pdfIn PDF document text
    • https://fujireroxilurig.weebly.com/uploads/1/3/4/6/134649353/kefapa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471959/normal_5fb6a46aa5c86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403283/normal_5f9184704b805.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/muvevanepen/customer_journey_map_template_google.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/analytical_questions_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d013730d-60c0-4fd2-8e6b-0d26d5878283/pedaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ceb2231-31dc-41f8-bbca-8753ab900af6/57715070895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c628c1f-1354-4d45-b323-e4af2566c744/rat_king_from_ninja_turtles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/099e8eae-c2b7-4db4-b552-a04899bc8408/vavujamisulakimuterafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682deebc-bb09-42b1-be2f-9feb1929566d/18201609656.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_off0000c935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC935 5548 bytes
SHA-256: bf6b0b1751df269e4f039850bb27b79f34be84704303c034270c2ca24c41638e
font_01_sfnt_off0000dc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3A 10800 bytes
SHA-256: 2d634662a8cb748ae8680b3ecf6ceb13c330a01754d1f0eb72b25708f31187d0

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