Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb765627672fe6df…

MALICIOUS

PDF

66.4 KB Created: 2021-02-06 14:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8d04b00487bb6c661cc71dac7f04c77c SHA-1: 20c76eed6a18eb0a9e58dba8b6dc5b0278f79c38 SHA-256: cb765627672fe6dfad1b5caaf45dff17025b86bea5d3211cd26b71969375d6c3
156 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 ClamAV and an ML classifier. It contains a large number of external links, indicating a link farm or phishing attempt. The primary malicious URL identified is https://baarspo.ru/aws?utm_term=uc+browser+apk+latest+2018, which is likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/aws?utm_term=uc+browser+apk+latest+2018 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382782/normal_5ff64e80662bd.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/mge0idH/nc_homeschool_standardized_testing_requirements.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487386/normal_60038b193e01e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505326/normal_601ba9ee04ca2.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/fTlQdgd/carpet_cleaner_machine_walmart_rental.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378425/normal_60075746132f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_5fd9f2f4a7df2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414672/normal_5fcd5368c398d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_60137d3979732.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/gntjcjf/57112050349.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404124/normal_5fc77051cd9b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393791/normal_5ff105d50e69d.pdfIn PDF document text
    • https://karesaxu.weebly.com/uploads/1/3/5/3/135392924/4184468.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/heSifib/59928168118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421767/normal_601de1cf3804d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_601a83c1263ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_600a4514aa800.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483354/normal_600298a37da42.pdfIn PDF document text
    • https://nupezodebugu.weebly.com/uploads/1/3/2/3/132302780/6455356.pdfIn PDF document text
    • https://gufekesunix.weebly.com/uploads/1/3/4/8/134888283/3091084.pdfIn PDF document text
    • https://rikisefunem.weebly.com/uploads/1/3/5/3/135337995/bcf9a42179f.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_off0000c3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B5 5732 bytes
SHA-256: fe5f661731d4d541113d51b3e2602a67aef367967fd69e85475187183c1998c5
font_01_sfnt_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 10416 bytes
SHA-256: f9ce37cbab55f29f06163f6f45f6c70efe4fc368ad7846532291d9fa370f61f0

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