Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea073e6d05f6844…

MALICIOUS

PDF

64.9 KB Created: 2021-01-09 03:05:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e0618c03c33184ba1058d82d1f8aaa0e SHA-1: e8cd11d1c92a88fd43b8d34a9dc8c16bf793f696 SHA-256: 2ea073e6d05f6844121fd94a0da2ab8df3f7e4c9164747c01d2371a17ba2dca2
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF files, suggesting a link farm or a distribution mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=law+for+business+and+personal+use+16th+edition+pdf PDF link annotation
    • https://watilokid.weebly.com/uploads/1/3/1/8/131856522/gomugokulixubejofe.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hgLlU7K/nejojelenafasoginefawadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418783/normal_5fd2c460bade9.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/teiirje/lowe_s_hours_today_memorial_day.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/zuwus-figusuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412768/normal_5ff8c40946f7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446019/normal_5fbac29273d95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488569/normal_5fe79be111f64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413975/normal_5fa7f1a0438fd.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/fajonubinomeder/zunoxaniruxaz.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/tupupiraludugibisegobi.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_off0000bfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAD 5508 bytes
SHA-256: 51e276d1cebd84a11bc50e54e23b08f1145608734eb5cc09a5eae0f89d4b5957
font_01_sfnt_off0000d27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27C 10512 bytes
SHA-256: 74619ba4610e90646d87e1649a47b6d1a1805ef855889a6e7caf8debb8bfc9ca

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