Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f55d3428603d5b…

MALICIOUS

PDF

81.3 KB Created: 2020-11-24 08:16:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fd5a4834c7244405e5d3e88410a9edb6 SHA-1: 3321e307d16c3816ae36c38effdadb1252329046 SHA-256: f5f55d3428603d5b70b73b672f2ade8424aa202f42e2d8366e184a191893200c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external links points to 'https://traffine.ru/strik?utm_term=he+aqui+yo+vengo+pronto', which is likely a phishing or malware distribution site. The ClamAV detection and ML classifier further support its malicious nature, indicating it is a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?utm_term=he+aqui+yo+vengo+pronto PDF link annotation
    • https://vajigapevinukaz.weebly.com/uploads/1/3/4/5/134578345/xozotunafu-zuvaviroj-jifuruze-molije.pdfIn PDF document text
    • https://jumabesabixoduz.weebly.com/uploads/1/3/4/3/134368642/c260296216707c.pdfIn PDF document text
    • https://taneromujek.weebly.com/uploads/1/3/4/6/134611199/183604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_5f8ffa908b515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f9b1b439c86f.pdfIn PDF document text
    • https://ruragivelexodi.weebly.com/uploads/1/3/4/6/134663557/7788432.pdfIn PDF document text
    • https://sufewusog.weebly.com/uploads/1/3/4/6/134644796/52acfbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/13bb8f66-de05-4a94-8cd7-c8d5f33bab92/44437623932.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/pazolaxali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d111283a-d434-4f88-9f45-02f7ebb21952/health_assessment_in_nursing_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/zaxisufasuvazoladivatatav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b136ed-df3a-4e82-8542-c9d9ad88d50d/92929376324.pdfIn PDF document text
    • https://s3.amazonaws.com/gajejasa/essential_cell_biology_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/72905477548.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_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 5024 bytes
SHA-256: 682560ad2958b15145ab192ed46cc1b87ffec527792323b062c9736ff1072e49
font_01_sfnt_off000110ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AB 11696 bytes
SHA-256: fc9d0ab42aeb48cb5c12fcd6f1da2827e39d3db82ffa5b72b7e4ba63349b484a

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