Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9400767ed7f1088…

MALICIOUS

PDF

81.4 KB Created: 2021-04-18 09:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8f8cc7076a3b50eb4a992ca13be0f02c SHA-1: 2e2b5012ceef2649fae11699b0474b48e4d425f1 SHA-256: c9400767ed7f1088d145d5a626ff2a252b89c38d84525f837798d264f2c05cc8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. The embedded links and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to drive traffic to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://maypoin.ru/strik?utm_term=metal+gear+2+solid+snake+msx PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476001/normal_5ff994ca861a2.pdfIn PDF document text
    • https://nowipulegetubut.weebly.com/uploads/1/3/4/6/134647137/nimifafotexe-febij.pdfIn PDF document text
    • https://nazumuliwoj.weebly.com/uploads/1/3/1/3/131383416/darukuf.pdfIn PDF document text
    • https://piximemob.weebly.com/uploads/1/3/4/3/134371032/5292610.pdfIn PDF document text
    • https://milavigik.weebly.com/uploads/1/3/2/8/132815866/2564726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_60419367206f0.pdfIn PDF document text
    • http://polibesafonujof.iblogger.org/nibukafurupag.pdfIn PDF document text
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/861fd55a543c3.pdfIn PDF document text
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/8366212.pdfIn PDF document text
    • https://ziwobusomuka.weebly.com/uploads/1/3/1/6/131607005/tekokize_widukuzepi_nivudaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464532/normal_601003b3cb8e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467017/normal_6010a7007ccb1.pdfIn PDF document text
    • https://lifigosup.weebly.com/uploads/1/3/4/8/134884960/sipinig.pdfIn PDF document text
    • https://demijogukif.weebly.com/uploads/1/3/1/3/131382539/gerewafarivige.pdfIn PDF document text
    • https://sikegupul.weebly.com/uploads/1/3/4/6/134681682/fipekogusapiwape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408881/normal_605aca334f4be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bapiwixobenilax.rf.gd/95245631876.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_cbb12b69918b4834a8c30dd3c8f3b5b5.pdf?index=trueIn PDF document text
    • http://rajafebinolug.epizy.com/belajar_excel_advanced.pdfIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_8a1dd24849714e1ebaae695dde4549e1.pdf?index=trueIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_b0b0d0d52bc942fd80fcb47e890ebf93.pdf?index=trueIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_7ce3f8192c9c430cbce32612df0d74e8.pdf?index=trueIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_60e27bad855940e58e9483adf5cff343.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_50f007cf6bd043c399d4e3d8f6fa5902.pdf?index=trueIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_856d350511934ac9b4845a55632f4165.pdf?index=trueIn PDF document text
    • http://faxiwig.epizy.com/21098382596.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_6588197d023949d1b88fdc8ec1c2ec85.pdf?index=trueIn PDF document text
    • https://d7504aae-3d37-493f-8789-a5629a6fcc30.filesusr.com/ugd/7ca9f5_75ecbf2b387248c7a4f22fedff4cf53f.pdf?index=trueIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_ed22adadccf049ec8d8a3fcbb2cb5bc0.pdf?index=trueIn 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_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 5416 bytes
SHA-256: 72a33dcdd7bef08909339f12565f5f6bc21ab4216c808b791f22fe37e82ef026
font_01_sfnt_off0001144b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 10456 bytes
SHA-256: 1ca5368c346d86b81832a1e2f4e00e3178911fdad81f182430cf92758de05529

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