Malicious PDF — malware analysis report

Static analysis result for SHA-256 59838b2ceeb68c65…

MALICIOUS

PDF

76.1 KB Created: 2021-03-23 23:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 293d1a8a8b515f82cd103c65cafb91a3 SHA-1: 2ec5b68735618321624bd6d03c558b664c00bccb SHA-256: 59838b2ceeb68c65d3f126e529957655588dd2401bc5f6a72d4e2e0b3d81049f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://crophysi.ru/strik?utm_term=how+to+install+fitbit+versa+lite+band PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402740/normal_5fe717ce55827.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461232/normal_5fe4e535c0ed1.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/k0he5oS/lost_grimoires_3_the_forgotten_well_walkthrough.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_6011a804d4e30.pdfIn PDF document text
    • https://cdn.sqhk.co/salosegebomi/gfvghNa/dark_mode_facebook_app_android.pdfIn PDF document text
    • http://xuroriwonufuz.scienceontheweb.net/karang_gigi_adalah.pdfIn PDF document text
    • http://moxipafuxoxo.mygamesonline.org/automatic_transmission_parts_catalog.pdfIn PDF document text
    • http://tegotapiw.scienceontheweb.net/2111374197.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495976/normal_5fdebcbec89a9.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/Fiwjggc/22993170774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379048/normal_5fd0470756a10.pdfIn PDF document text
    • https://cdn.sqhk.co/tepikipo/aQF6njc/xamibulo.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/RgdGoid/business_administration_definition_wikipedia.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/89715b06-44ec-44a0-8bb9-cd22afdcb22d/ar_verbs_spanish_worksheet.pdfIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_db24a1bfbd83416aaf7efe98b7fb513a.pdf?index=trueIn PDF document text
    • http://gitojaxekeveki.onlinewebshop.net/properties_of_axiomatic_system.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/7647972018.pdfIn PDF document text
    • http://jofanemapax.epizy.com/angeletta_font_free.pdfIn PDF document text
    • http://dupivet.epizy.com/36905400402.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_2c733b76906b4c53a4b674171a91c043.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_478a04deff084d41b655e3d026e33a93.pdf?index=trueIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_ce073f8c747a4eaa8fe937cfc044300a.pdf?index=trueIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_3db8ce45157c48d5bf1850eadd9cabcc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/473442a7-15fe-49dc-b0fb-2814338dbc4e/21630818698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afecfbcd-863d-43cc-b173-c6e9ef68527b/what_is_vocational_rehab.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_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 5152 bytes
SHA-256: 93667821acc284b880cbf461861a4fc8327ebcf5130a240932b8370c9b0a2911
font_01_sfnt_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 11428 bytes
SHA-256: 6b96e515f93f971c7052aae8890fb80cd3a3cfe603d6bb6aaf4340f808d40471

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