Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9a3fff3e6c18cb…

MALICIOUS

PDF

77.2 KB Created: 2021-03-21 22:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03df8f080e6a83bfc1d11ac5e513a7e5 SHA-1: d353685eaf537f1018818f660857e43e9e61bb24 SHA-256: da9a3fff3e6c18cb5d2da9b9e914c50fa4d83ab6ae7d7f666324be045846c705
66 Risk Score

Malware Insights

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

This PDF document was flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a distribution mechanism for malicious content. The document body, though partially obfuscated, indicates a lure related to 'extra practice chapter 5 skills answers', aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/wix?keyword=extra+practice+chapter+5+skills+practice+answers
    • https://dapinolun.weebly.com/uploads/1/3/4/7/134762022/warez_xuwugewal.pdf
    • http://vir-tus.com/75681162115mgipz.pdf
    • http://mugedly.xyz/how_do_you_find_the_surface_area_of_a_cylinder_formulam0f3x.pdf
    • https://posolefuriw.weebly.com/uploads/1/3/4/3/134374222/pamawogujuxoku.pdf
    • https://cdn-cms.f-static.net/uploads/4490528/normal_604f615b91f54.pdf
    • https://molapoji.weebly.com/uploads/1/3/4/0/134096941/woririri_tiliz_fanozidufax_bepiro.pdf
    • http://politach.com/living_by_the_indwelling_life_of_christ1fp5i.pdf
    • http://sukutoxuwurif.mywebcommunity.org/73862453427.pdf
    • http://com-servers.online/dyson_dc35_filter_catcha6wl8.pdf
    • https://static.s123-cdn-static.com/uploads/4367294/normal_5ffb4b8d71848.pdf
    • https://static.s123-cdn-static.com/uploads/4393181/normal_5fcd3a00dcd05.pdf
    • http://wersita.space/the_great_ages_of_world_architecture_by_g.k._hiraskark3jvy.pdf
    • https://fuwemuwiwogul.weebly.com/uploads/1/3/4/0/134016804/5011311.pdf
    • http://getbuiss.online/malibu_outdoor_lighting_system43pt8.pdf
    • https://static.s123-cdn-static.com/uploads/4465400/normal_5ff9fae12309a.pdf
    • http://kulotufiw.mypressonline.com/conservation_of_energy_practice_problems_worksheet_answers.pdf
    • http://jiwabozaxexe.mypressonline.com/i_am_a_child_of_god_song_chris_tomlin.pdf
    • http://timelessdecorum.com/48848125926kx6hq.pdf
    • http://interior.estate/alucinaciones_y_delirios_librok6mta.pdf
    • http://vienvozvrat.site/ponyo_on_the_cliff_by_the_sea_english_dubgqgsg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vawolibosabope.rf.gd/15074065944.pdf
    • http://mowiweret.rf.gd/12364328148.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50c.bin
32c7377234c488f3bf2a2d5fc56de925354b7ee243f24061bfa4ab1fa908e867		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 5004 bytes
font_01_sfnt_off0000f60e.bin
9ad1386cd322c9ed37b399f9a0b372758465e1760f937557e0e93f1443357320		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 10280 bytes
font_02_sfnt_off00011942.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11942 4324 bytes

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