Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a3677b94a7651c…

MALICIOUS

PDF

75.8 KB Created: 2021-04-04 04:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8eaf9ac61bb7cbe41778c0538dc60c3c SHA-1: 0b2c07ea25948698b51938e8c0cf6e9d38a09edf SHA-256: e7a3677b94a7651ce9a1e9cd6cded0d5c75c2c5704ea0dd79aa0dbf16927d94e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/wix?keyword=va+net+tangible+benefit+worksheet+2020 PDF link annotation
    • https://cdn.sqhk.co/lepavenujal/o7HHgds/22368043065.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/whitehall_ii_study_of_british_civil_servants.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/jh2jaNa/zuzaxipurozed.pdfIn PDF document text
    • https://cdn.sqhk.co/nibijegun/cTjbTgj/verizon_inside_sales_rep_salary.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/qklgfri/i_can_paint_game_free.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunagakiz/M6Jhhji/35841139150.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/d4jdfn5/daily_routine_list_app.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/13418919216.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_80d3aa312e6b4530bc90402a53069588.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_80fa521dc07448b79a9dcfceaea66bbc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/netinuwa/88678735098.pdfIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_a4c6031afcae4ddf84b71eedc7d65b5e.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_59e32cdf48b74490af14c72b47fc52de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/daily_planner_sheet_printable.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_70875269a3264b10b9afcbbb325fe1f6.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_4dbc091fe6ff42e5ab09e50552d23fd0.pdf?index=trueIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_4316300e686144b0946e62e6cf44ddc3.pdf?index=trueIn 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_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 5564 bytes
SHA-256: 78a9338eaed3122a2d1ad2f4f33bb31f0155261d30129887f0af69ba54d59cd0
font_01_sfnt_off0000fe37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 10620 bytes
SHA-256: 3a304e6a224a3a53dbf35a73c3157c66f3f5973b4e562dcecc32926a3b015ec6

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