Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bf54d064133492…

MALICIOUS

PDF

62.0 KB Created: 2020-12-26 04:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2d12b06a8f31b0d77235d275f976f546 SHA-1: 2cfbc6d38fadc48f13506317a57ff7760dd78279 SHA-256: a7bf54d06413349283961e430eae5b5f7b7215d080004c43012478de2734db19
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to S3 buckets, which is characteristic of a link farm designed to distribute malicious content or phish users. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as a phishing trojan. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a 'tour de france motorcycle reporter' title, suggesting a lure.

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://traffmen.ru/strik?utm_term=tour+de+france+motorcycle+reporter In PDF document text
    • https://cdn-cms.f-static.net/uploads/4487662/normal_5faea7a5ae85f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415334/normal_5fafec83d24e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5fc57703bae5e.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/ggjchj5/weekend_getaways_from_dc_covid.pdfIn PDF document text
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/15f033c04f.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/faluzotixupi/encuesta_sobre_habitos_alimenticios.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/sample_treasurer_s_report_for_nonprofit.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/73866435221.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/davis_drug_guide_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/grade_3_english_grammar_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/89884542423.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/1148519320.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB941 5172 bytes
SHA-256: 0f5f35e11143c280bb0a4b80d9f8966da02f265e7a378af237ba1596052b4ea0
font_01_sfnt_off0000cad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD3 9612 bytes
SHA-256: fc477e6d42439c0a2f69f0f3e47e2ec241773b4b54658541de24d8beb262f3d6

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