Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc16d7c43608af59…

MALICIOUS

PDF

81.7 KB Created: 2021-03-23 00:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aa15179e2ebe1fce861f183c654202d7 SHA-1: 92355f74f3595a559cb57d992332460ea2f89ce0 SHA-256: dc16d7c43608af5966424338637536c4e62803f0bf26e4dfcdbf3bf886ab8c65
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=oracle+sql+date+format+in+select+statement PDF link annotation
    • https://cdn.sqhk.co/jinavefajevo/RejdjdC/luxitegigegevoliro.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/ggjjpjc/chemistry_study_guide_ib.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/haheVdU/average_monthly_cost_for_universal_life_insurance.pdfIn PDF document text
    • https://lilonukile.weebly.com/uploads/1/3/4/7/134767916/1c01b0.pdfIn PDF document text
    • https://luresigixake.weebly.com/uploads/1/3/5/2/135294948/lisubigugifew_wogev.pdfIn PDF document text
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/bidelafoxi.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/71714987427.pdfIn PDF document text
    • https://jaxoruxevag.weebly.com/uploads/1/3/1/6/131606876/2342747.pdfIn PDF document text
    • https://cdn.sqhk.co/jogowijalaro/fgcyepJ/18807514360.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/bibXuig/tifibajalixokug.pdfIn PDF document text
    • https://pudeputuxokaj.weebly.com/uploads/1/3/5/9/135968230/sadewa-lasitetob.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/hicEghM/yellow_lightsaber_rey_skywalker.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/cjfOGih/diboronibazuro.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/51966815365.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/c7e972c2-a859-427f-9a33-485a0f06e42d/data_structures_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_855d5ad68c7141fabe9e310996503f10.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7faca6bd-d074-4d3b-b3a3-1125b1b1ac2c/used_commercial_coolers_and_freezers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a6d876b-ec8f-4507-b623-90b9cdbd0de8/vietnam_guerrilla_warfare.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_a5dc1d4b621e4144bcc200b1f1eebf44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0482328-a4b4-4da2-a132-b8b8703121bc/revisit_the_philippine_professional_standards_for_teachers_ppst.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df68fbc-6ea6-46ba-a1e1-5bfad51e716c/juwexuxalazelawejil.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/xugeluno.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_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 5320 bytes
SHA-256: 58793cb78d3a0836ebe2480ff83146556e86a7181507e5640625dea74e77d6cc
font_01_sfnt_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 11220 bytes
SHA-256: 5c101bd46dff41228b2602f574ef396a370bf640c932be502e825b7f3aae84b6

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