Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d99071e9fcbc08…

MALICIOUS

PDF

87.8 KB Created: 2021-03-30 21:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ad563ec56c71686f40fb58d116760cf6 SHA-1: 402f8c212104fdb6a3adcef20f3795ae24a595d9 SHA-256: a9d99071e9fcbc0847464269002a968aa68464a7e5f8567e4469d73e6727e4f9
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or redirector. It contains a large number of embedded links, many pointing to disposable hosting or known redirector infrastructure, designed to lead users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=cbse+class+12+commerce+syllabus+2020+19+pdf In PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/vapexabib.pdfIn PDF document text
    • https://dekukosozo.weebly.com/uploads/1/3/1/0/131070054/0baece986797.pdfIn PDF document text
    • http://jesipuvapuse.iblogger.org/tugolewek.pdfIn PDF document text
    • http://juzagunugix.iblogger.org/adobe_photoshop_brush_tool_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xezalagefog/dCrKcs3/amazon_alexa_app_for_android_5._1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483610/normal_60599464b813d.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/hijddjg/freedoom_android_wads.pdfIn PDF document text
    • https://cdn.sqhk.co/visevunu/hjmxLih/tebubukunekiwowewor.pdfIn PDF document text
    • http://mebesovinu.22web.org/minilidiwowolezikad.pdfIn PDF document text
    • https://totovipuvo.weebly.com/uploads/1/3/2/7/132740708/nibemejaxodevu-kabex-sakosuwegofonu-nifofukoxufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409797/normal_601bacf66ee66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420602/normal_600c0019cfe45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407784/normal_60583de5e4af8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zubikexef.rf.gd/derimibowopubativifekutub.pdfIn PDF document text
    • https://1f9cfe0c-d655-4514-b58a-75380282e405.filesusr.com/ugd/d31784_196720efad7f429199468be86fa7a809.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_9b301ccf1c9d41128bad2067c41d3c14.pdf?index=trueIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_59e41b7af60d4a6e95eb65fa1ac22038.pdf?index=trueIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_e639198ce25b4e9dad7bcb581d3efe16.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_525bb52a140e40cca300b1f7f8a1c37b.pdf?index=trueIn PDF document text
    • http://kisidop.rf.gd/reporting_hierarchy.pdfIn PDF document text
    • http://gixopesibesuges.epizy.com/8979500958.pdfIn PDF document text
    • http://vumubogapem.epizy.com/36438666153.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 3080 bytes
SHA-256: 0fcef192c95d6fd4d5333de3e5f0a04c8525a73f6e29f4febd37223f58d6e746
font_01_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 5932 bytes
SHA-256: 9379044471e08dcab11441e85f45caa2aa6a5582266b66f66ba8455edfae88b1
font_02_sfnt_off00012b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0C 11148 bytes
SHA-256: d3899dc20c99f7a629a49a7e1c2ebb487bddb585d5dcc03a37f58cc0418349d2

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