Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3ac407f357deb5…

MALICIOUS

PDF

75.0 KB Created: 2021-03-10 10:09:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b255850ffdbcab85de8a7a06baa4a872 SHA-1: c174025ad322c2e76b9064f549cac8bb2c6f4fcb SHA-256: 5c3ac407f357deb5bd8082b5a8f6d85f1db065547a0b4f669a4e4a4f68d5bb97
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/aws?utm_term=which+book+of+jasher+is+the+real+one PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366047/normal_601756e37fbb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418963/normal_5ffea7918b44c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472768/normal_5fc95cee68c54.pdfIn PDF document text
    • http://rorureferujuraf.22web.org/corporate_governance_report_of_wipro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_e276dddb1e5c47459c7f3050d609cfa7.pdf?index=trueIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_ac9a877ad4e2494faa5d31e2643c2f1c.pdf?index=trueIn PDF document text
    • http://vonolukover.epizy.com/best_stylus_pen_for_android_tablet.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_3d858e3c3b694a0ea5e257f8176a0f8f.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_da7407232ba64b3eb581d6f4b3ccb39a.pdf?index=trueIn PDF document text
    • http://nodixuzotegiv.rf.gd/photoshop_design_background_images_free.pdfIn PDF document text
    • http://guwibigebozodeg.rf.gd/lutisilebitekagopijupox.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_917e9fcfb3744b7c8ef432e973d5b0a5.pdf?index=trueIn PDF document text
    • http://wibofupenavoj.rf.gd/indian_mythology_books_to_read.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_ad8c7c080de94da5a981a01c55770e8c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8369a2db-aa2a-42a2-8542-374b979a940d/dozafapaxavejebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985893b6-6333-4a84-b881-4610a1450d0a/what_size_is_adidas_mini_football.pdfIn 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_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 5264 bytes
SHA-256: 71a8e00236c74fb80053ddc1a1154308fe3b83957f85b9597179c858290746a2
font_01_sfnt_off0000fb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 10400 bytes
SHA-256: 2421be740a632ad3c055be51f9dec92a44546fe6d2dee38967f674318c985239

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