Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66adb9f73e772e4…

MALICIOUS

PDF

79.5 KB Created: 2021-03-24 09:03:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a5f174c8b484359b0ac8dbb3aebf4b95 SHA-1: ed10922a2f9a610880e4e9888f7537b21d1a4509 SHA-256: a66adb9f73e772e4d41dea7e09a77f27cc52602834c00c2bf9f30e41199468a4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to other PDF files, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or deceptive content hosted externally, rather than containing an embedded exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/award?keyword=itil+v3+change+management+process+pdf PDF link annotation
    • http://uplrezina.site/50475646312jn6bk.pdfIn PDF document text
    • http://prosale.company/44493113774h1g8s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485446/normal_6044daaead918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_600d8b884d8c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491148/normal_604b5413a3864.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420244/normal_5ff8609bebc3d.pdfIn PDF document text
    • http://legiontry.online/mosojazt5lrn.pdfIn PDF document text
    • http://trysoda.pro/leading_change_john_kotter6l9gk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_3fa3a270601744fa9048696c8e921a8d.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_2932c8fa494c410ba103fb1a7618ec66.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_41fc12612e9e4d36a072982e5e2c400b.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_9fcb5089d4874beb9e86107d90627789.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vanatul/furopig.pdfIn PDF document text
    • https://35503bd4-e3bf-42a3-b196-9304570062b9.filesusr.com/ugd/e3c460_3f3ebf1e00464a5fa4ffa31fa066a8e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zasepo/2012_dodge_avenger_rt.pdfIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_d65d928171344f5baba9083bc023da6c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/puzzle_game_master_answers.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_a409240e3f0b4045910a612623c59561.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_c493989ca6074327a2758107c46a9305.pdf?index=trueIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_0d23e45fe07240039b6c7db6a5cecaf5.pdf?index=trueIn PDF document text
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_8420c6c66c8e4a32a5e145d624df6b35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokit/kubokipanitegubun.pdfIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_41be24772d9c4aa2b2cc7be96ca0db50.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_5e63856bd282467d9fef67d196d61e25.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_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 5728 bytes
SHA-256: ea77b21b3a311d3739db741d265237889080ef45aac9a18b09cf235de98f757f
font_01_sfnt_off000109be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 11308 bytes
SHA-256: d2d7642890022227f29e42e52d4c9c943dc261fbd1f09b9a4f7aa3e68ab578d0

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