Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17b1c459199b20b…

MALICIOUS

PDF

60.3 KB Created: 2020-11-19 09:59:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e623bd9f7aa38c660bfd149c24c08f4a SHA-1: 9cf675217225dd3a86ed9d57f66a471d63cbc15b SHA-256: d17b1c459199b20bf565c417a669aa2571d7b9a87ed211806c3c8a83b6764f2b
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of external PDF links, suggesting it functions as a link farm. The primary malicious URL identified is https://traffking.ru/123?utm_term=behind+rebel+lines+reading+level, which is likely used to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=behind+rebel+lines+reading+level In PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_5fad8a857699b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5f88f30cc5e02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404730/normal_5fa49413d9bbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f8dbda5d8cc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_5f9677b422951.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/7955184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410986/normal_5f968f429e498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5f8dfdcc1cdbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5f8b96238c962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f8a1c3ccad4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_5fa831eb08596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427076/normal_5fa9352d09786.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/nigimul/vokekoxiza.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/mathematics_formula_of_class_11.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_off0000adc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC4 5336 bytes
SHA-256: 21bf84706e41d539d803561e4683dbe3d2d221e4b0813d43ce04749b95829e8d
font_01_sfnt_off0000bfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE4 10176 bytes
SHA-256: bc63003aed7a5f1d615ae17da4846d5f18ba931dd4c305d8d9f97263d8771d97

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