Malicious PDF — malware analysis report

Static analysis result for SHA-256 706fa0c7676bd935…

MALICIOUS

PDF

69.9 KB Created: 2021-02-17 16:32:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8b68a070fe9a99a4f7267fbac18f9b1b SHA-1: a89de69cde5cef9419271b3389196c7608edf759 SHA-256: 706fa0c7676bd93527a3890ef679fc14578f04940e2e60e7af2761a282faa395
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 link farms, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of suspicious links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a likely attempt to distribute malware or phish users through external sites.

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://jacksth.ru/wix?keyword=copper+chloride+and+aluminum+formula PDF link annotation
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/3063361.pdfIn PDF document text
    • http://life-news.tech/342793153052revn.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/1999806.pdfIn PDF document text
    • http://tortomsk.ru/alonso_e_finn8qj3n.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/descargar_vmix_21_full_crack_espaoljefvy.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/cXOichi/vuwifex.pdfIn PDF document text
    • http://ita-talia.fun/science_et_vie_photographiekcmow.pdfIn PDF document text
    • http://cookwellbakewell.com/invaluable_meaning_in_tamilhzfho.pdfIn PDF document text
    • https://bubosetew.weebly.com/uploads/1/3/4/5/134515161/kibubebudomavav-fanul.pdfIn PDF document text
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/8a9dcfb1a.pdfIn PDF document text
    • https://lagomide.weebly.com/uploads/1/3/5/3/135304015/fatobugeseni.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/dMgdifM/2000_picoseconds_to_seconds.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/hfjbdih/free_kicks_soccer_unblocked.pdfIn PDF document text
    • https://datevasipagudi.weebly.com/uploads/1/3/0/8/130874205/1898735.pdfIn PDF document text
    • https://xewulatejema.weebly.com/uploads/1/3/5/3/135345986/394818.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/bIz0REv/rome_total_war_alexander_review.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/lerezazo/lobanuwiwemosoj.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/confusing_words_worksheet_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/charts_and_graphs_worksheets_6th_grade.pdfIn PDF document text
    • http://warixogaje.epizy.com/96368333711.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_off0000d5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 5124 bytes
SHA-256: 9ebea2b60a9b556bcb4f6acd295bd0ed47e9ff98664c9693e78a4f7b3d2d1cbd
font_01_sfnt_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 10376 bytes
SHA-256: 891bb7d770c2a4c0a31193867f210089b771c572ebd4ae1d1cdf9ee7d1bd4d1d

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