Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cab260cb5f51da8…

MALICIOUS

PDF

76.0 KB Created: 2021-02-16 12:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 01beae4face690ab5b3d1cc283957330 SHA-1: f7fe2438723d91321fe256a7c36b217864c3e4fa SHA-256: 6cab260cb5f51da8c4bce9f793318016896e6277629f8c146238415ad23402c0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. One of the embedded URLs, 'https://druttle.ru/123?utm_term=what+to+have+for+dinner+tonight+vegetarian', is flagged as unknown reputation. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', reinforcing the malicious classification. No scripts were extracted, but the overall structure and link farm indicate a phishing or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=what+to+have+for+dinner+tonight+vegetarian PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446170/normal_6016d280dd1f6.pdfIn PDF document text
    • https://xasigali.weebly.com/uploads/1/3/4/3/134363336/fc11da83cf1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5fcae7b3ca494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394062/normal_5fe84642175d4.pdfIn PDF document text
    • https://vifazadaza.weebly.com/uploads/1/3/4/8/134883600/kasofuwod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_601b377b0cd14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5fedf4868b02e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369640/normal_5fe4b5574e345.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5ffcda553bb80.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/moduluzuxikari/soxesozaf.pdfIn PDF document text
    • http://bojedujob.rf.gd/extentia_group_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/bitwise_operators_in_java.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/base_de_dados_definio.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/walolujazabuwuwu.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_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 5032 bytes
SHA-256: b1a528d753561d371cacf7646fae9b09bc3c9c0b0c9c334ceed37854c15ee77f
font_01_sfnt_off0000fddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 10956 bytes
SHA-256: 40ac4b492d8b2f0ed83b462f6d8b22f9c32f62f5920732790a8fbb785eb7c89b

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