Malicious PDF — malware analysis report

Static analysis result for SHA-256 58441ab9818ad49e…

MALICIOUS

PDF

76.4 KB Created: 2021-03-25 05:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 229ff5c861c549898a83ed747aafcf28 SHA-1: d617f94ea1fa88942585d40834b8075bed69f326 SHA-256: 58441ab9818ad49ef3069921d2f2cd9ffce19fac5bb491f2920a192820b594d9
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm, with numerous external links, one of which is a suspicious URL. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://jumiwimov.ru/wix?keyword=microscope+mania+word+search+answer+key
    • https://static.s123-cdn-static.com/uploads/4366661/normal_60087b79ea487.pdf
    • https://static.s123-cdn-static.com/uploads/4391037/normal_60046e5563d04.pdf
    • https://static.s123-cdn-static.com/uploads/4460944/normal_5fee84f51a09b.pdf
    • https://cdn-cms.f-static.net/uploads/4408335/normal_60531908ebe1f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ninazarila/xetasiwonisitawilofoxus.pdf
    • https://s3.amazonaws.com/xepululejiwof/bu_jhansi_online_form_last_date.pdf
    • https://s3.amazonaws.com/gixawetopoli/belkin_wifi_range_extender_installation_guide.pdf
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_97c72fb1060d49aba58c46b138197d24.pdf?index=true
    • https://s3.amazonaws.com/mojivikapeti/accomplishment_report_in_mathematics_deped.pdf
    • https://s3.amazonaws.com/datarofapakil/vehicle_registration_information_online_gujarat.pdf
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_476f1eaabb61495f8a5a358edc2bf9bb.pdf?index=true
    • https://s3.amazonaws.com/buwosevax/vmware_storage_best_practices_6.7.pdf
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_460839c3a8fa4c44bfb5978f7741934d.pdf?index=true
    • https://s3.amazonaws.com/rujabepifar/miller_syncrowave_250_manual.pdf
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_88c39069164c4e539d858db9a45e71d2.pdf?index=true
    • https://d397443b-80d0-4e74-967c-4ce830ee3754.filesusr.com/ugd/0a76f0_c259478b58304930a79beb1902d3f85d.pdf?index=true
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_23e549fbedcd4f74a89161029d6aa8e8.pdf?index=true
    • https://s3.amazonaws.com/paropabaru/facebook_stock_performance_ytd.pdf
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_8d14e42b69fa4158b295c2b242f5ccf3.pdf?index=true
    • 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_off0000ebac.bin
9f1273d4dd0dd103ad0fbabcb6bdca00d663de4e0bd2f745269e76696ad1e74a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 5544 bytes
font_01_sfnt_off0000fe7c.bin
8888d30ba9910e1809290698cd77b46382b54d30b19d0a5e68d56d6e20dda1a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7C 11084 bytes

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