Malicious PDF — malware analysis report

Static analysis result for SHA-256 452e1c05aa1b5b14…

MALICIOUS

PDF

68.6 KB Created: 2020-12-20 16:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e84def10cf95dc7d127712526dcba14d SHA-1: 4d33e21c50157ac4a6663cc4ec47e058b76ab81e SHA-256: 452e1c05aa1b5b14b007291ded56d0e9f08451363d469815207455478ad86c62
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, with one prominent URL leading to a suspicious domain. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://trafffe.ru/strik?utm_term=rock+classification+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369926/normal_5f9083677dbe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5fd2e49e97848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5fbd912c28885.pdfIn PDF document text
    • https://dubozenerur.weebly.com/uploads/1/3/4/6/134687155/9664615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5f96f0ec0b677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_5fbab565534ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481515/normal_5fbe27316e1d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/genedonapubefe/aleister_crowley_el_libro_de_la_ley_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/zofemojipaputiguli.pdfIn PDF document text
    • https://s3.amazonaws.com/lesepapusojifax/25462327525.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/77829059361.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/nimililivepak.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/xarisetavizezurejovunob.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/destiny_2_jotunn_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/medical_assessment_form_pa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F6 4920 bytes
SHA-256: 8129f08ea81bab7181e87ece66d4260376efa64ebc4a938b769326c2bf9ecf62
font_01_sfnt_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 10580 bytes
SHA-256: 34bda01aa438dc8b6235179fc7eef381ea1a19ce9dd75977dc0a6f9d6c692f74
font_02_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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