Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84bf67577ad16e9…

MALICIOUS

PDF

80.7 KB Created: 2021-03-12 14:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 88df673e5dd73a9415b952bd8629f642 SHA-1: 7cc9bb77655ab9fd11506e3e0dc88158b77af92a SHA-256: e84bf67577ad16e92400d029aa7ff9c7f3a8e96ac7307ee3130dde998583df2a
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jottigo.ru/award?keyword=lab+attendant+syllabus+2020+pdf PDF link annotation
    • http://pozijuza.scienceontheweb.net/66316684135.pdfIn PDF document text
    • http://souve.me/cesam_centre_de_formationbqsf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_602f6cd56cc6e.pdfIn PDF document text
    • http://laluwaraselolar.mywebcommunity.org/65258641932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413361/normal_601e20ec146e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414677/normal_5fcf0e7b022b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5fce92edbda97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447250/normal_6022c9223e8d6.pdfIn PDF document text
    • http://getliterate.online/todibowagijigofupl8jh6.pdfIn PDF document text
    • http://doucheop.xyz/star_trek_insurrection_movies_streamingtyt77.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/147f7e34-8276-4480-83d5-569ecf07d3d9/totelunebunaxexujexukis.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/wozavesoxe.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/wadofijavagebexusoxo.pdfIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_fbaf06188b8b46bea97e15347b7d4181.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_4b2d91e1d9164bd8bf6e29f37369f5a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22103d61-7885-40b0-a6fa-eb5fad94d374/76273284827.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_6a9278d087d740bdbdfef7feb0dea7de.pdf?index=trueIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_8b41327904534a7dab2c97b2f7dca791.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/best_app_scanner_for_android.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_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 5396 bytes
SHA-256: 731e1628b111e59b22dc9ed7816f4387b4b9071f4b6357e939ee481506a4b3ad
font_01_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 10784 bytes
SHA-256: edd41be542aa913d3275d42aae2b80a3f1a8d09f1a0b3381ef4857bbc4041442

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