Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7083bf1b74ff1c3…

MALICIOUS

PDF

81.4 KB Created: 2021-03-22 09:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b58cfb52cc37f685841291ea1594a0d8 SHA-1: d5b8b97545aa069611be7a9c89bec24b6e5a1569 SHA-256: c7083bf1b74ff1c35d27e5983b005cba53fe4be376dc2b97f397032dd605629c
126 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it is a link farm on disposable hosting, directing users to a suspicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI point towards a social engineering attack to redirect users to a malicious site.

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://resalured.ru/award?keyword=etymological+dictionary+of+persian+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379842/normal_6049b41a4da78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369786/normal_5fca09c049bb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407781/normal_5fe2d2bfe96bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_60540b5f6785e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_809da3e47d45443ebcb4f0f1c4796b9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00fbf2e8-fee5-4dab-8070-6d03c114bdd4/84613980938.pdfIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_2ea31bff55b0481a916323cf0d63aa19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeponowon/84322665381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91279de8-2ce2-4946-bc68-cc3b4af6af2f/dunifin.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_69411de2584d4fa39f0ec86d1147dccf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1954c2-7259-4830-89a5-43e92dd82b8a/gujojefegopuv.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/speak_now_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9108ae80-52b5-4752-9c5c-bb78bd0af8b5/rugajagizizudavomaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/686b30c7-40d0-4936-8176-fcf0287087ef/ligovowem.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/zelajexufaregizalejovoke.pdfIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_5e5cba70a9cd43da8bdf14a97c65373a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/dewogakepurewimeguzoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf6eb74-c4db-40c8-ad50-ea38c65d863d/zezeravuvamegikebovofolom.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000113e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x113E9 21412 bytes
SHA-256: a8ae2aeb8591092ca363cc08bdb87c0c203319b4f84ae45dd2cc45d9a7ba427e
font_00_sfnt_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 5532 bytes
SHA-256: e5219684125eb8739f899d1bcad10693ace8ca1b53183537d99aae14f40294e1
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 12088 bytes
SHA-256: b0c02a9708a63512dd8db8f6c9e30e717beedb4397a7a790c3a873aa4c6bbb7c

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