Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0d0e9ba63478db…

MALICIOUS

PDF

67.6 KB Created: 2020-11-26 01:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6c387c7d05b21d40cf28363873783bb9 SHA-1: 46e6c664bbbecc138f7f22ebbbe6b0813fec19ce SHA-256: 5b0d0e9ba63478db24e956d46e8702287cdb51e063540a982e3b15ab09d6441d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO spamming operation. One prominent URL, 'https://trafficel.ru/123?utm_term=barbados+blp+members', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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/123?utm_term=barbados+blp+members PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5f8e0c6c3623d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_5f9f8aac981a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5fbeb79fd6868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449193/normal_5fba98c3e8dac.pdfIn PDF document text
    • https://nukewixe.weebly.com/uploads/1/3/4/3/134385223/femolil.pdfIn PDF document text
    • https://gunewobeje.weebly.com/uploads/1/3/4/1/134109175/savujezifo_terewas_forozovitudi.pdfIn PDF document text
    • https://gazasajud.weebly.com/uploads/1/3/4/8/134879445/9294169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_5fb8cc8018de5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_5f9ff3011f147.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/davubewu/18888929646.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/62962831373.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/simple_solutions_math_grade_5_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/kogebozuwukajewiruriniso.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_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 5296 bytes
SHA-256: 322fe343bcc1ecd9daab08f4e14b9d71233d1c26a0e999f908e3f0a4ebd2ff5f
font_01_sfnt_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 10848 bytes
SHA-256: 11480c485c48c9b0a569cf26ab816865a7fec5c5b4fbcf23bbdee898e6e552cd

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