Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da0169c5b4541f9…

MALICIOUS

PDF

61.8 KB Created: 2021-01-03 04:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7cbfaa3d0da968f077c3a361a4eaf52f SHA-1: e0e502aa461007ac316070b4befe16bac0c8bcb2 SHA-256: 7da0169c5b4541f97fc32917e2ed0817c71036c9d9d1848de9337cfd77d80188
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, including one to 'trafffe.ru', suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards a phishing or malware distribution vector.

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
  • 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://trafffe.ru/aws?utm_term=horse+head+clipart+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425256/normal_5f99e7d2e220d.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/RTtWpg3/26719663660.pdfIn PDF document text
    • https://fusefediwotedi.weebly.com/uploads/1/3/4/5/134589876/93588b4.pdfIn PDF document text
    • https://cdn.sqhk.co/wememiguw/PcheZ8g/rifetipoperududewi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac94696a-759d-4ef7-a0ef-56eece2519e6/resetibafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceda679c-7db2-4729-8379-9dbaf977ef9c/fukubopikonorosakerixoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6cc1add-902e-41d0-a83b-8ea4794f0b5f/17391009586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9618a66f-bc73-4a6d-970d-dbf0970668ae/depuwovuvizajamofibeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c081a67-c82f-42d5-b85a-15182f4c78ff/56731794784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a343864-cc9d-4601-ac96-c951e86dfb06/vutubezun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b862a7ae-8fd9-4f46-84c1-f7a14263a486/acta_de_reuniones_ejemplo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca76a949-50dc-40ea-9b99-b61f7e3b8a3b/sakura_school_simulator_update_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c441d57-0e1e-4f39-9505-939302e8ea4d/colonial_nations_eu4.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_off0000b658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB658 5204 bytes
SHA-256: dff5b152ab6247336ea02262d16c16fe5c8bb9680399208aeb2f2c7b27041a7e
font_01_sfnt_off0000c805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC805 10144 bytes
SHA-256: 1bbcf25574ccc096229bf859042fc82d52f64aa967bca2d6e6c74cc73ed95fff

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