Malicious PDF — malware analysis report

Static analysis result for SHA-256 521e9fed191c7915…

MALICIOUS

PDF

75.3 KB Created: 2021-03-17 03:09:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aac53efd4e376dfd513755965a220103 SHA-1: e93ef67cdeb04ebbae093dc0f74c45c33869a377 SHA-256: 521e9fed191c791519b424ef2e09ff5b8b2dbd4fae6734a7e40cc0bc88b6dfc4
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 0.9999

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://soxebez.ru/wix?keyword=the+world+wars+episode+3+worksheet+answers PDF link annotation
    • https://gilitizek.weebly.com/uploads/1/3/4/1/134131368/kakenen.pdfIn PDF document text
    • https://cdn.sqhk.co/gisanewat/QshjQib/smart_bracelet_your_health_tracker_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/ihaMVkK/dekibowonekibomipazag.pdfIn PDF document text
    • https://cdn.sqhk.co/lofesaxudiwo/gdigjjl/influencer_marketing_companies_nyc.pdfIn PDF document text
    • https://bikewodeganesu.weebly.com/uploads/1/3/4/5/134596115/a6ad15e27.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/gebLSif/2__6.pdfIn PDF document text
    • https://wowemaba.weebly.com/uploads/1/3/1/3/131380083/zodebiniwofon.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/d58jihf/first_national_geographic_magazine_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/ge30kdu/62919017682.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/aih2Ejb/duxawo.pdfIn PDF document text
    • https://gidedumewulo.weebly.com/uploads/1/3/5/9/135961218/938a0d4c62d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab1a935-4fb9-4459-8d66-7dc86e0d58a2/common_core_math_worksheets_4th_grade_division.pdfIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_50cf0662c73c4fa6a6948387d425e4ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0c824e-2e55-4de6-bb11-ed6696fd8a82/wuzope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7dd28ab-4da0-417d-9e6b-40030daab237/60655577467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc539ef5-0fdf-4288-ae35-367287f9ddba/craftsman_evolv_table_saw_accessories.pdfIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_ac8d6301cce74b8ca7945689faea4771.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55deb49-15cb-47ff-bee0-2a0e2ffbe7b6/international_journal_of_innovative_research_in_medical_science_indexing.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_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 5316 bytes
SHA-256: 680800013329aaafe8558ad671600c74bc1c40fff16f2cca5424f68fab89e8fc
font_01_sfnt_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 12508 bytes
SHA-256: 3ca4dc2d38070d797a5d350df6b3445c66701b238e7527ee65668170c3bf627b

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