Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cac8bca55a68023…

MALICIOUS

PDF

73.6 KB Created: 2021-02-24 12:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f8d533f419a2067d2d36ad62fcd7b27f SHA-1: 9d3ce679cd376f3430dfff8ff287e0a837b629eb SHA-256: 8cac8bca55a680239852bae8466bfece6caea140b0f4509f03b16dcddd96c29e
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the structure and numerous external links indicate an attempt to redirect users to malicious 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://jottigo.ru/123?utm_term=comparison+and+contrast+paragraph+examples PDF link annotation
    • http://timelessdecorum.com/dioses_dela_mitologia_griega_y_romana_comparacionj3oi9.pdfIn PDF document text
    • http://greyfruit.space/caller_id_faker_apk_fullqsmod.pdfIn PDF document text
    • http://fenellalucynelle.info/24462142880dhw6x.pdfIn PDF document text
    • http://life50it.pro/grim_grinning_ghosts_sheet_music_pianomd5fu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_5fdaad7a1da74.pdfIn PDF document text
    • http://reduslim-ufficialesito.site/estrategias_basicas_del_sistema_jitdy58q.pdfIn PDF document text
    • https://durosokikiw.weebly.com/uploads/1/3/1/3/131379956/9042d5a080e87cd.pdfIn PDF document text
    • http://konanozopesan.22web.org/jorazepitidasaliz.pdfIn PDF document text
    • http://nout-prodat.site/63656036968phupm.pdfIn PDF document text
    • http://topfrag.rip/easy_guitar_songs_with_2_or_3_chordstxg2w.pdfIn PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/b70b26416.pdfIn PDF document text
    • https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/mapevak_sokibofowo_konewanijezifu_rabejotava.pdfIn PDF document text
    • http://nigma24invest.online/divinulepezugemulofuna5c0vm.pdfIn PDF document text
    • http://bigmagazin.xyz/metal_gauge_thickness_conversion_chartvp8oj.pdfIn PDF document text
    • http://mmmmmme.space/47269887212kg1dg.pdfIn PDF document text
    • http://mabay.fun/free_video_editor_20195xuct.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xonelamurojili.rf.gd/alien_ant_farm_greatest_hits.pdfIn PDF document text
    • http://jitumevadegoz.rf.gd/xuxukupixodazuronavavevu.pdfIn PDF document text
    • http://fubusomarixemuw.rf.gd/epfo_result_marksheet.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_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 5460 bytes
SHA-256: ad5ec0b6f31e75abc0867d92dbbde57f25e0e60f1ef795a147f8213831c1fd31
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 10408 bytes
SHA-256: f17f23e5bd6929413cb4bd225b198224ce5b0a24c42b0a1a6970206a881125df

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