Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62982121e64c37c…

MALICIOUS

PDF

83.5 KB Created: 2021-03-16 18:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 79f77faa198dcfcc2931f02e2517da5b SHA-1: 031aa5d6f08cd67aa9dafa9c2a8be5de585aa500 SHA-256: b62982121e64c37cca30ccc04b0a1bb6b59d969f2404d6c1d557c9a661bd8618
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern focused on redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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://xezojetit.ru/strik?utm_term=is+the+egg+cell+haploid+or+diploid PDF link annotation
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/4e39a23617ad3.pdfIn PDF document text
    • https://rizafoxuz.weebly.com/uploads/1/3/4/8/134852064/dunipasavap-telemepuvefoza-rilajelumugizel-tepidurukoridud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479254/normal_5fc74ec0c4ec5.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/padoro.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/352ab6214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414159/normal_5fd87c58283a2.pdfIn PDF document text
    • http://gukabibus.mygamesonline.org/bixoledejezezajuvuwemedod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_6036c28ea5650.pdfIn PDF document text
    • https://vifiboreb.weebly.com/uploads/1/3/5/3/135349596/8062030.pdfIn PDF document text
    • http://jofised.iblogger.org/rokebepujowalalotelugi.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/dazogubanesijidimexise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_5fd27e24e57be.pdfIn PDF document text
    • http://gupirigugorixuf.sportsontheweb.net/how_to_read_fingerstyle_guitar_notes.pdfIn PDF document text
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/71a544eec87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370317/normal_5fcfed1893245.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_859d9f55c9724cc58ec11a0670c10a83.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_94065588228842d485fa602f7e3ae894.pdf?index=trueIn PDF document text
    • http://bowawimuwojigaf.rf.gd/22573499845.pdfIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_8d025b248ee445bc85b54ad7dbcc52d0.pdf?index=trueIn PDF document text
    • http://buvazow.epizy.com/alaipayuthey_tamil_full_movie_free_hd.pdfIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_023ffb01b4874c979f88378fb7b2df97.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_5ae5dae1af4641d4916d377475b90b23.pdf?index=trueIn PDF document text
    • http://jalugegaru.epizy.com/abdomen_exercise_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c85cead-011f-48cd-b2a7-8354e3d77415/formulas_de_volumen_y_area_superficial_de_cuerpos_geometricos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf0174f-87ec-4171-ac21-25066c308f0b/37629027298.pdfIn PDF document text
    • http://sukokovevaz.atwebpages.com/68743783489.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_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 5272 bytes
SHA-256: a794747c6aac5eabf351b1fc6f9e73e405e77e1ac4068341d9e488053547cc31
font_01_sfnt_off00011424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11424 13532 bytes
SHA-256: 7dd5d7a0873709fc40d5cd2d8269933c0dde35a3f74729df433da8a5453ec39f