Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1959566ef03eea7…

MALICIOUS

PDF

85.0 KB Created: 2021-04-01 04:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: be3521ccbbef9a661c0335941085f85b SHA-1: 4050d4fd21aacbffcdd213bb64d158876429ec75 SHA-256: c1959566ef03eea73670011245d70d750ea794f155aa5b885556237104994227
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and identified as a link farm. The primary malicious URL, https://seumenha.ru/award?keyword=egyptian+arabic+grammar+book+pdf, is likely used to redirect users to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=egyptian+arabic+grammar+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5fd6d41d65068.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/cowon_plenue_d2_price.pdfIn PDF document text
    • http://fezufizibum.mypressonline.com/ejercicios_abdominales_trx.pdfIn PDF document text
    • http://teguruta.medianewsonline.com/comment_fusionner_plusieurs_documents_sur_mac.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/74471957895.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/cours_d_allemand_gratuit.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/lab_8_population_genetics_and_evolution_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490369/normal_6020c4e5bf8dd.pdfIn PDF document text
    • http://rolorutebu.sportsontheweb.net/68570225024.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/497b681f-fd0f-48db-8b7c-e0edffbcd0cc/26186456904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3900ebae-dc33-4d34-af53-ff5847d0e924/brandon_marshall_boxing.pdfIn PDF document text
    • https://63c031ef-a76e-4574-b6c7-b683c5cdde0f.filesusr.com/ugd/3a5e7a_2e3fc49487cc4e59a38463630b5e191e.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_c07542276107436ea51c5fd62b7ec43b.pdf?index=trueIn PDF document text
    • http://zasuwunal.myartsonline.com/xonazudobuti.pdfIn PDF document text
    • https://38c8c62e-1823-4c1e-8220-bc61efcc8a1c.filesusr.com/ugd/c24b9b_b1ab47548e154cfdba1ec43dfed4b34a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ce90a6a-80ce-4021-883a-7eacaa5d6e9e/cyber_security_course.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_3bfbcbbd178d45afac2cb58616c86f2e.pdf?index=trueIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_ae850ff7a2a04c04a2296833790b2c80.pdf?index=trueIn 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_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 5528 bytes
SHA-256: 41613ce31ba4193b6a3f801b19ea26ba401dcdc72d7df8d821d7044aa0ba8271
font_01_sfnt_off00012113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12113 11124 bytes
SHA-256: dc109a7e499fc2919587a9b3f1a60594b7b99cd960596750fb225ab73bab91d1

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