Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee5dcda91af5d5e…

MALICIOUS

PDF

74.8 KB Created: 2021-04-16 02:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d9d1322d4a2a48b35a8fe92a78eb11f8 SHA-1: 228713e7814b414e9836ac80ad156f15a772889d SHA-256: eee5dcda91af5d5ef225221fc9ee47a9439d078647becec12b472da1374f8dd1
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm on disposable hosting further supports malicious intent. While no scripts were extracted, the document's structure and embedded URIs suggest it is designed to redirect users to potentially harmful content.

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://pelibifir.ru/strik?utm_term=best+books+to+read+after+the+hobbit PDF link annotation
    • http://mebevevi.mywebcommunity.org/93478158660.pdfIn PDF document text
    • https://ditoleruv.weebly.com/uploads/1/3/5/3/135345680/gowuluned.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/23859473507.pdfIn PDF document text
    • http://zutelotojenexop.getenjoyment.net/gutudefazukenetev.pdfIn PDF document text
    • http://tazizinujumijoj.mywebcommunity.org/january_to_july_current_affairs_2020_in_english.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/koxuk.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/3823653.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425759/normal_5fee7d5051bd6.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/nufabovitite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_606317898d8be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dafukip.myartsonline.com/brother_2270dw_setup_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e75773f7-3ef2-4a1f-be22-f2c322284c82/tibamofipipaluwuzolox.pdfIn PDF document text
    • http://najekaweza.onlinewebshop.net/analgesicos_nao_opioides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee52d627-0f44-482c-a363-f2b1ca7db4b8/30141560450.pdfIn PDF document text
    • http://dilutibu.onlinewebshop.net/canula_alto_flujo_pediatria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8eec8f2-e3a6-4fd4-abdb-429d22641b0c/motorola_baby_monitor_mbp33xl_extra_camera.pdfIn PDF document text
    • http://nakixaxev.myartsonline.com/cost_accounting_notes_for_bba.pdfIn PDF document text
    • http://pusebirenox.myartsonline.com/28254551408.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_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 5216 bytes
SHA-256: da52c7bfac4fce727ed691f0104f383ba9a52ede2505cd79b62b0181b34cfd6c
font_01_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 10380 bytes
SHA-256: 3cbd7e91db992a32b9e074bd92f20f585b3b9706a0364baf1723fec8e45e82af

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