Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a3a8b999d322ce…

MALICIOUS

PDF

73.3 KB Created: 2021-06-12 03:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b29a32930b4b790d24e027da441aa608 SHA-1: 0baa476db2119c04eaa31c23b4ea384ffeff5e9f SHA-256: 24a3a8b999d322cee13770ae14df1f025117c1c749f3cee77349429974568ae7
186 Risk Score

Malware Insights

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

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 0.9991

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://garglob.ru/pbw?utm_term=avancemos+2+textbook+online PDF link annotation
    • https://levubitadogu.weebly.com/uploads/1/3/4/7/134727965/fazulizeso.pdfIn PDF document text
    • https://zetopemonosur.weebly.com/uploads/1/3/4/6/134678414/mivekiger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_600f9de33fec5.pdfIn PDF document text
    • https://sazetikegiwujo.weebly.com/uploads/1/3/4/8/134895432/divudamumag-nibomudu-zesol-nufagajazuleni.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/a1dd99.pdfIn PDF document text
    • https://tavabaxo.weebly.com/uploads/1/3/1/0/131071290/bodut.pdfIn PDF document text
    • https://roralolew.weebly.com/uploads/1/3/0/7/130775143/3509199.pdfIn PDF document text
    • https://nakusiwikabudu.weebly.com/uploads/1/3/4/9/134904560/1555005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_603ea91793e57.pdfIn PDF document text
    • https://balimalovi.weebly.com/uploads/1/3/2/7/132710770/cdd7e6879eeed.pdfIn PDF document text
    • https://lajawenofuki.weebly.com/uploads/1/3/4/5/134501859/ritaxomujomitonip.pdfIn PDF document text
    • https://tojumemi.weebly.com/uploads/1/3/1/3/131379390/6021653.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5fc894b1dfd59.pdfIn PDF document text
    • https://benanuvez.weebly.com/uploads/1/3/0/8/130813453/e559e22.pdfIn PDF document text
    • https://gujudosisalo.weebly.com/uploads/1/3/4/7/134737216/buxawosulagugufadoke.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/a0c585f0-9b0a-4b73-8b81-d6d499af7cc3/lixidapojaremaworikok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2116d580-1b2f-4b98-9c7c-97fa5f7005d9/active_listening_skills_for_middle_school_students.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/asme_boiler_and_pressure_vessel_code_free_download.pdfIn PDF document text
    • http://nabivebufi.pbworks.com/f/1015805688.pdfIn PDF document text
    • http://wekibivu.pbworks.com/f/one_piece_mugen_games.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/w/file/fetch/144883983/twrp_apk_download_no_root.pdfIn PDF document text
    • http://pagorevet.pbworks.com/f/xokedodenovusupunokadapin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d94b807a-9455-4f98-bc54-1cb26ef3b5be/world_of_darkness_books_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58742ec-ecdd-4a23-877d-c648ee220932/javugig.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_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 5304 bytes
SHA-256: 1287db97af0ca2b711726b30107be95ae8a41ede858ad57d8247f0864d900512
font_01_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 11108 bytes
SHA-256: 71b9f8d88d0994b9c42134f43d22d54887e78cf0e5ec0f54a97774188f884466