Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53960116b66d425…

MALICIOUS

PDF

66.7 KB Created: 2020-11-19 18:06:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fc81bf114ce4724c82413e6571ebfec3 SHA-1: ec678e9894e82305b7ed6f58f0ce3281523efccc SHA-256: c53960116b66d425a28e8f6f63a1f7bf0327b984520e23c574919b6775f58a1f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent external URI, 'https://trafficel.ru/strik?utm_term=scuba+diving+calgary+lessons', is likely used to direct users to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware delivery.

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://trafficel.ru/strik?utm_term=scuba+diving+calgary+lessons PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461205/normal_5fb56186675b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_5f8c8500bc4e7.pdfIn PDF document text
    • https://nepigisebax.weebly.com/uploads/1/3/4/4/134477897/6465231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_5f90719e01ed4.pdfIn PDF document text
    • https://paxowamowutujaf.weebly.com/uploads/1/3/4/3/134322095/086ca75b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f872e0b536f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448096/normal_5fa3324468ff0.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/wonoti/como_atualizar_o_android_pelo_pc_samsung.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/baje_baje_re_shehnai_jain_song.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/baxapobuvuzapubas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c602bfe-2edf-405d-98b9-98b9b9fc8f2d/72221900567.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/cold_war_vocabulary_reading_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/matasodewug.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/pcv_mcv_mch_mchc_rdw_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd15880-c072-4caf-b39f-d9a005ab508d/noritz_error_code_11.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_off0000c6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6ED 5512 bytes
SHA-256: 1f08fd7770408a0897a40e682a0eebe7e4d0ac628110f820426ea38f7aee29f9
font_01_sfnt_off0000d9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C1 10628 bytes
SHA-256: 6d21a5bab2e04c8f362bab7c5c2e1108a19775d7d8074c01113ecd711c533722

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