Malicious PDF — malware analysis report

Static analysis result for SHA-256 c865e124d7b166eb…

MALICIOUS

PDF

78.5 KB Created: 2021-03-14 18:19:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f03ec1bbb3d442abd1e139cd60308816 SHA-1: 75afeec9c101fdab27a401cec2c09246e0fce1e6 SHA-256: c865e124d7b166ebefdc414a154a17d1ff48203a605ec8d899721d90f03f4060
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one pointing to a suspicious URL that appears to be part of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external links and the overall heuristic firings suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=fraction+action+87+worksheet+answers
    • http://miravatiz.22web.org/funegagabimole.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_5c1c217790b3464c83887822c0e011b4.pdf?index=true
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_cf14e13094db497b9321732ec159e3e8.pdf?index=true
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_6e7e23a3ac9d44158845249d981a4027.pdf?index=true
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_f7c1357b22f64d9f9927396c7bd8597b.pdf?index=true
    • https://s3.amazonaws.com/bomifabipi/lejot.pdf
    • http://wuzuvulas.epizy.com/angular_formarray_remove.pdf
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_470ed48c59bc4e15829045624e88e8e1.pdf?index=true
    • http://vadarawofi.epizy.com/what_is_comptia_project_management_certification.pdf
    • https://s3.amazonaws.com/zesotat/11362984166.pdf
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_3612e5bcfb714c748b56d94e854b6d16.pdf?index=true
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_3729a6457dbc4b2f9a8fa50c4db73cb1.pdf?index=true
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_cdeb01ddbb5347cea9bff8a165b119ef.pdf?index=true
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_b9afea9259b348fa829a9a626a2eb61f.pdf?index=true
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_afb5ce731f8c43bfa3e2f1594b23238c.pdf?index=true
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_294314d8e6aa42188eedad6269f75a9e.pdf?index=true
    • https://s3.amazonaws.com/pegozegi/excel_data_sheet_format.pdf
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_82e7120dfd8d40f4bca47390665ba122.pdf?index=true
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_13419d86355d46549b44bc3cac7f0d50.pdf?index=true
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_14b33d4747a94d0e9cd774fc35cdcb14.pdf?index=true
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_9567d2a5b37242a7a062044ade78a6e2.pdf?index=true
    • https://s3.amazonaws.com/dejazuvorira/macos_beta_catalina.pdf
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_3544154ec69c4d7e9cab687545071a53.pdf?index=true
    • https://s3.amazonaws.com/vavapekadoliti/ludarogazuxudunuzunurapu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f556.bin
cb9f6fb22a2a2f19a0a38d9bfb1f71aee21a0ddf806de5476e295e2d9c6b341b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 5240 bytes
font_01_sfnt_off00010742.bin
f2efdaea491871db21b11486a225ef2b41ba8d811b4f4a48e0b2fe8bcb8fe03e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 10812 bytes

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