Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eddf1541aa066d7…

MALICIOUS

PDF

75.9 KB Created: 2021-01-26 08:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b520f25de568650bb8fdcada66b01f8d SHA-1: 1927605f0c33bbe5c34287c6a75997250ee0ff90 SHA-256: 1eddf1541aa066d757020f147cce5ffaef80153d9c4867e94b4c57a3bed512fd
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of many external links suggests an attempt to redirect users to malicious content or phishing sites, aligning with spearphishing attachment tactics.

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://traffset.ru/123?utm_term=mindshift+barbara+oakley+review PDF link annotation
    • http://misiliv.66ghz.com/aerogeneradores_de_eje_vertical.pdfIn PDF document text
    • http://gijutudubesakuz.iblogger.org/mojaxomakaxuwibugazilag.pdfIn PDF document text
    • https://donelodef.weebly.com/uploads/1/3/5/4/135401433/patudujesenoxukeji.pdfIn PDF document text
    • http://figojusu.iblogger.org/michigan_child_protection_law_mandated_reporters.pdfIn PDF document text
    • https://vumiluvitut.weebly.com/uploads/1/3/2/6/132696113/xabebodepuzepaket.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/DzsDigX/bike_race_free_apk_uptodown.pdfIn PDF document text
    • http://fifuxuzod.iblogger.org/cautionary_tales_jon_bellion.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vutame/hiragana_practice_writing_sheet.pdfIn PDF document text
    • http://vozoxutizetu.epizy.com/67801968929.pdfIn PDF document text
    • http://leruxesotagas.rf.gd/miller_s_analogy_test.pdfIn PDF document text
    • http://dexegudev.epizy.com/instagram_icon_font.pdfIn PDF document text
    • http://jerananixakuzeb.epizy.com/aerial_power_cable_installation_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/suxopawadigi.pdfIn PDF document text
    • http://zuraravata.epizy.com/invalid_server_certificate_on_android_phone.pdfIn PDF document text
    • http://bonoburadik.epizy.com/xadanuvanugobi.pdfIn PDF document text
    • http://sabozet.epizy.com/mri_brain_atlas_and_text.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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 5460 bytes
SHA-256: 10ee0bb083361655da2db4565e01cfb19fd5e1ef4a13bc2b31d43eed81acf989
font_01_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 10772 bytes
SHA-256: 62e6b1982e81c0d1c37ee2e3fab44862bef1a2eaa346c203606d958578ceb234

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