Malicious PDF — malware analysis report

Static analysis result for SHA-256 37df209d337e9622…

MALICIOUS

PDF

74.5 KB Created: 2021-03-20 07:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4755e58f8e61a766692b32c294a353ac SHA-1: ba089cc2008ed4f9182a5a88dc9e9eb6e0a5e128 SHA-256: 37df209d337e962292a71edb860ebaefd2b25740abb1f6eabfcc431484f39479
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a phishing attempt. It contains numerous external links, including one to 'maypoin.ru', suggesting it functions as a link farm to redirect users to potentially harmful sites. The document's content is obfuscated, but the presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malicious redirection scheme.

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 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://maypoin.ru/123?utm_term=christian+guided+tours+of+washington+dc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402740/normal_60076ea38a00e.pdfIn PDF document text
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/4744988.pdfIn PDF document text
    • https://sekamaxe.weebly.com/uploads/1/3/4/5/134590712/1cab86ac9c.pdfIn PDF document text
    • https://rojurunonujimos.weebly.com/uploads/1/3/5/3/135325454/sipuniwulegavevogig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477615/normal_5fdff9741db68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459062/normal_5fec9a7c8b3b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_6030787e5c426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426425/normal_604e61c398cc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496216/normal_5fd386c95c30f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_6020a993f35b9.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/02f063af-3c66-414b-b403-aea6931a3106/indian_criminal_law_books_free_download.pdfIn PDF document text
    • http://kidoputuf.epizy.com/characteristics_of_birds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f7dcbed-e2d7-48dc-a04b-e38aa5778332/volver_al_amor_de_marianne_williamson_resumen.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_cbd600d53723442b830078263e83cad5.pdf?index=trueIn PDF document text
    • http://panadokopejed.epizy.com/vutavorosoluzumijewukux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3efef74-b1cf-460d-a5c8-554b4511accc/63516501105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6398f405-0ff3-4664-9b38-57583f6905fd/xinanagenolovasulir.pdfIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_6e5d3a7987734f3fb0fc2d5dbc5e51e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa25d782-1171-474e-8fc6-ec6ff00f6b2b/80559230625.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_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 5248 bytes
SHA-256: 965480df78ac850b9f8f4a85908dcf7b426be4956396c84ab4fec751a4e5c841
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 11832 bytes
SHA-256: 4b3172ed6d91457c76b173f7d781361f0a78bc5a5795beb6bc6c55ddb01a147b

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