Malicious PDF — malware analysis report

Static analysis result for SHA-256 2589077393a3b481…

MALICIOUS

PDF

79.1 KB Created: 2021-03-28 02:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: da73d5d9e2127944f661f220920d8bc1 SHA-1: 9593d497cafbcd18e0dc4ac8030e299e6b365356 SHA-256: 2589077393a3b481e142ee154f4126b0419e0028a6cb0c893105f1c3892470d3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm, designed to direct users to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to exploit users by redirecting them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/123?utm_term=tupitube+desk+animation PDF link annotation
    • http://gidujoluj.mypressonline.com/xuleg.pdfIn PDF document text
    • http://judupebe.getenjoyment.net/xuvapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_6024b23340cc4.pdfIn PDF document text
    • http://towonededuv.medianewsonline.com/descriptive_language_that_appeals_to_the_sense_of_smell.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/breathing_techniques_for_copd.pdfIn PDF document text
    • http://vixabaj.scienceontheweb.net/56155638959.pdfIn PDF document text
    • http://megiloreb.mypressonline.com/easy_algebra_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_6014a40a25347.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/xuras.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/6440474420.pdfIn PDF document text
    • http://dasazopemobor.mywebcommunity.org/apprendre_l_arabe_classique.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_d092fd0e94fa43d0b63c5425f8c79b24.pdf?index=trueIn PDF document text
    • http://kadizilurojiniz.onlinewebshop.net/att_u_verse_guide.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_282eec15d4764c51a6555c2f88269105.pdf?index=trueIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_51ce3f39bf8843ba952fbd67af417ac1.pdf?index=trueIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_0130b0a5567c425fb21f5319011992f2.pdf?index=trueIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_2c0666fcc35c4aaba55f0f8c33115ef3.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_454985581cea4224a7f92db934545bff.pdf?index=trueIn PDF document text
    • http://wuwedilejom.myartsonline.com/beckett_baseball_price_guide_2020.pdfIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_4f8c2288194a4bd29a3d47060dea3f07.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_beaa61264e064fac9dde2ea9282c3a40.pdf?index=trueIn PDF document text
    • http://rijemow.onlinewebshop.net/ziweluwoli.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/easy_flat_belly_diet_plan.pdfIn PDF document text
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_4157ec49c28040128267b622480d82c0.pdf?index=trueIn PDF document text
    • http://nuzikenevizut.onlinewebshop.net/78812599409.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_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 5128 bytes
SHA-256: 69a677d10e73655204dfb3013461c968b81c924a75fe4c3b140f46a264f951e6
font_01_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 11372 bytes
SHA-256: 7852b728435679558072b1baaaa2bebb69701b39f10b24791990912e29685ed2

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