Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6507ba49d91e69b…

MALICIOUS

PDF

69.0 KB Created: 2020-11-20 18:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e862b5753cb5838cc3ef6b63fe19e584 SHA-1: 99d75c5cbbf5e7aa6802a19752cbbb082c1ca9c8 SHA-256: d6507ba49d91e69ba92b9fff8f5fa20bb62031aeeff5e85cb27b2db2d19f23cf
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The embedded URL `https://trafffi.ru/aws?utm_term=sam+wineburg+historical+thinking+pdf` indicates a potential phishing attempt disguised as a search result. No scripts were extracted, but the PDF structure and numerous external links point towards a malicious intent to redirect users to potentially harmful content.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/aws?utm_term=sam+wineburg+historical+thinking+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377706/normal_5f8b83e873941.pdfIn PDF document text
    • https://merigufut.weebly.com/uploads/1/3/4/3/134357701/bbc06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492897/normal_5fb7f17d74476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425917/normal_5fa65f8427339.pdfIn PDF document text
    • https://fiduvoxasugi.weebly.com/uploads/1/3/4/8/134856114/lotidiparitomigaduju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_5faf462b9cdc4.pdfIn PDF document text
    • https://gomigara.weebly.com/uploads/1/3/4/7/134727279/3592901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376612/normal_5fa0d1e649dbd.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/sofud-vujafobaxoga-posabiwixafe.pdfIn PDF document text
    • https://sulidisige.weebly.com/uploads/1/3/4/3/134318683/c9ae03ff049b2.pdfIn PDF document text
    • https://jutoduxozerepep.weebly.com/uploads/1/3/4/5/134599773/genaxegemabupifokuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413697/normal_5f9eb0a7a2b5c.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/poloxetosavi.pdfIn PDF document text
    • https://nixejinalir.weebly.com/uploads/1/3/4/3/134321479/rabezubitikatip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_5fa092ff2ef7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 5968 bytes
SHA-256: 9710e0975afefd7d78d542980a1a047cde178f79cd07cd4483d6d408317dc500
font_01_sfnt_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 10524 bytes
SHA-256: b51975fe70eabf058d5a2d0377ad88c913b58d6d7bb412ecb3cd714376421aa6

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