Malicious PDF — malware analysis report

Static analysis result for SHA-256 1651eb432db8f35f…

MALICIOUS

PDF

88.9 KB Created: 2021-05-11 04:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 99650032e31229b5bf75673b4ae9b8e3 SHA-1: ec450545b85d0472057a95d7ec90bbe97367c47c SHA-256: 1651eb432db8f35f059479e28fff940edc983e6af48cced4e3820c589c55ead8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via social engineering, likely leading to credential theft or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=what+is+the+purpose+of+imagined+community PDF link annotation
    • https://cdn.sqhk.co/juzosugun/bqbhchg/slide_away_oasis_ukulele_chords.pdfIn PDF document text
    • http://raifaisentgo.online/59310172457kf12a.pdfIn PDF document text
    • https://cdn.sqhk.co/nixibaraje/ibyHgig/monkey_mania_penrith.pdfIn PDF document text
    • http://d-youtube.com/197008450552x4h8.pdfIn PDF document text
    • http://vvinorama.website/galaxy_wars_fighter_force_2020_modlceh5.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/biology_of_belief_full_book.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/iaabgaP/perodisukenejozodef.pdfIn PDF document text
    • http://vivudanu.scienceontheweb.net/guvogoruferoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jufogitomob.onlinewebshop.net/end_of_6th_grade_math_assessment.pdfIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_4bc97894005c43f78cbb469c3e31ae00.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b459e927-f5a3-457b-b1a3-04f29865c8ee/robiruvevubarejefoguduvo.pdfIn PDF document text
    • http://tosurok.myartsonline.com/49486576027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759c6267-dcac-44a0-a355-5f388788486a/xijetaripurepiminamumel.pdfIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_971386b82ba74a04ae68a6d5a612d3ea.pdf?index=trueIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_8173c327f13449239756a6ce20c09882.pdf?index=trueIn PDF document text
    • http://tediguku.atwebpages.com/nutelogefaf.pdfIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_4a1839ca10f84d78a849cbf365840f2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/417455cc-0d8a-43b5-8409-4ca0ea513912/sketchup_programa_arquitectura_baixar.pdfIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_32438256b06745818b87d907de5301bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/380b7aba-1c5e-4e77-acb1-99525044cf1f/active_and_passive_voice_worksheet_grade_8.pdfIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_20d0c82507044de598ffe9e945c2daec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c46e6d2e-de4e-41a1-9929-e945c655338a/max_all_social_links_persona_4_golden.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 5536 bytes
SHA-256: 2bdab49b5b8b572f8859a5bfef192498c4a170fb0a43114b0b2c23676a0379ca
font_01_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 11108 bytes
SHA-256: 2ab6543abe2107e94ad8ef4c5b121c00a58578eabdae51ec01374e968e08e3bc
font_02_sfnt_off000145fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176