Malicious PDF — malware analysis report

Static analysis result for SHA-256 5889ad2fbe0e4830…

MALICIOUS

PDF

94.5 KB Created: 2021-03-13 23:34:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd302feb3a3f52c47d0b0f9125473553 SHA-1: 2e6d0dd90515a0408c5dd23e63bb71c91660de71 SHA-256: 5889ad2fbe0e4830e1dc1d15b0f74a08b5adfdbcb5301ce3b072a35f04585e50
74 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier strongly suggests malicious intent, and the presence of a link farm on disposable hosting further supports a malicious purpose. The embedded JavaScript likely serves to download or execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://resalured.ru/123?utm_term=hadoop+architect+interview+questions+and+answers
    • http://vezerfa.xyz/texas_instrument_ti-30x_solariys18.pdf
    • http://vusejulene.iblogger.org/michael_jackson_best_moonwalk_performance.pdf
    • http://kvrovk.xyz/explorer_8300hd_format_hard_driveo1ywb.pdf
    • http://hq-cleartv.info/how_much_ram_can_i_put_in_a_dell_latitude_e6410l2ooj.pdf
    • https://static.s123-cdn-static.com/uploads/4459321/normal_60048a5cdfebe.pdf
    • https://cdn-cms.f-static.net/uploads/4423454/normal_600aadc30bcdb.pdf
    • http://dreabling.online/cheese_plant_leaf_templatev52jk.pdf
    • http://wokulorumal.iblogger.org/happier_music_sheet_with_letters.pdf
    • https://static.s123-cdn-static.com/uploads/4482403/normal_6003f1b970022.pdf
    • http://patedeziw.mypressonline.com/que_es_un_bosquejo_literario.pdf
    • https://static.s123-cdn-static.com/uploads/4451228/normal_5ffc1a0cb5b66.pdf
    • http://vamoktin.ru/90974769617skw2a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_be8c935c1cca44fd8f507cd71155dba4.pdf?index=true
    • http://sifebina.epizy.com/nhs_self_certification_form_scotland.pdf
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_512abcfa3bf945d48714e2c313936c4e.pdf?index=true
    • http://tuzoxizusuzu.epizy.com/aramark_uniforms_catalog.pdf
    • http://rulenanevatetid.epizy.com/ketamutofepewelinuseduw.pdf
    • http://gelutosedufom.epizy.com/tifafofobiwozi.pdf
    • http://lafeseg.rf.gd/dead_cells_pc_portugues.pdf
    • http://bafopivazizaxon.rf.gd/brgschaft_wohnung_muster.pdf
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_a90e99cebcfc451daada6af531a0832f.pdf?index=true
    • http://kuwitabetegipo.myartsonline.com/85010290776.pdf
    • http://pizibajavodup.epizy.com/48609777314.pdf
    • https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_78d0445ea7eb4a4ea138627f7769af9d.pdf?index=true
    • http://mamitepibo.epizy.com/torizitidipigu.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_off000125ff.bin
ae18d3ed8720bccd0535cb36925a4ffd9b2eef97d3f1b5f28720218cca3628f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125FF 5248 bytes
font_01_sfnt_off000137d9.bin
2609e43ee19dcff0283e404aad8391d9c9bfd611c1a464666e6d46e332c666b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137D9 11152 bytes
font_02_sfnt_off00015d92.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D92 4324 bytes

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