Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a677035a49b41b4…

MALICIOUS

PDF

83.1 KB Created: 2021-05-12 19:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6ff961cdc71b197f55efba870fdf4880 SHA-1: 7003c90b06baa94a5e22cefef2a10ee983273471 SHA-256: 5a677035a49b41b44828e9b763e834374752ec93f7d7796b01477c365e805370
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://soxebez.ru/strik?utm_term=how+to+hook+up+rocketfish PDF link annotation
    • https://fefefilax.weebly.com/uploads/1/3/2/7/132712664/gisemipikekunagajoni.pdfIn PDF document text
    • http://xopaberowiwin.getenjoyment.net/evento_vascular_cerebral_isquemico_y_hemorragico.pdfIn PDF document text
    • http://bigno.space/acknowledgement_of_paternity_form_california6fv1p.pdfIn PDF document text
    • https://xolitosoxi.weebly.com/uploads/1/3/4/5/134583661/eccf7f879c.pdfIn PDF document text
    • http://riragukigud.scienceontheweb.net/problem_based_learning_indonesia.pdfIn PDF document text
    • http://qrastenmap.online/valag91ktx.pdfIn PDF document text
    • http://es50off.pro/4118137134508erv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da81a9e8-1b8a-4af9-b583-8a98ccc37b27.filesusr.com/ugd/2d797c_359a191788254e1aaf278656156c0f45.pdf?index=trueIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_357404be50cc46b0aa083f087683b2d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49661dfe-382e-445c-870b-476572c314ce/how_to_read_body_language_with_pictures.pdfIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_3ea66a2507b9481583f9f97d51805f1b.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_18ac5bcaa7a04aa7850d5be0fc149f7c.pdf?index=trueIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_c53f2011a1dc4fcebc6c92428d0084d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bdf8850-cb69-4bf4-8260-d9cd782b554e/mississippi_drivers_license_renewal_locations.pdfIn PDF document text
    • http://bidajalej.onlinewebshop.net/subject_object_possessive_pronouns_worksheets.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_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 4980 bytes
SHA-256: e159f5e866087b975f3edd26267b416caf3bb7f36548727581375761f3309614
font_01_sfnt_off000118e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 11504 bytes
SHA-256: d4db411bbb56088fedddefd3466dd7e0536ca3c44e6da4be0e8ca886c4937d61

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