Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b325038eb754ff6…

MALICIOUS

PDF

82.5 KB Created: 2021-03-12 22:06:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9c1de8a37bd669b349fcb168a209e676 SHA-1: 9a08eb45f954c9f57ea07049510d01762b144359 SHA-256: 4b325038eb754ff660ae7f9d65ff3e6fd3665c00be8ac721f97b38aae5ed6810
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://jottigo.ru/award?keyword=antihistamine+drugs+pdf PDF link annotation
    • http://mailedflkf.site/1928560754vl21b.pdfIn PDF document text
    • http://vekvelo.ru/59430952170vg0if.pdfIn PDF document text
    • https://bipewajebij.weebly.com/uploads/1/3/2/7/132740639/6055606.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/gomumurekaxe-fijobuvof.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/mapegeluvizamubol.pdfIn PDF document text
    • http://xilatotes.sportsontheweb.net/36084275332.pdfIn PDF document text
    • https://nogetutiru.weebly.com/uploads/1/3/4/7/134711470/60677.pdfIn PDF document text
    • https://jasefukop.weebly.com/uploads/1/3/0/7/130776564/5291368.pdfIn PDF document text
    • https://lolosovosozo.weebly.com/uploads/1/3/4/8/134882251/9032156.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/self_dependent_meaning_in_bengali.pdfIn PDF document text
    • http://iuts.space/64118967300wy2o9.pdfIn PDF document text
    • http://trycabinets.xyz/basic_pr_strategiesuvitc.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/email_attachment_google_drive.pdfIn PDF document text
    • https://kanelepamub.weebly.com/uploads/1/3/4/1/134132184/1041460.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/8062176956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bfe7859-702e-4329-94f5-3f45cd8ae9c1/how_much_does_a_carrier_high_efficiency_furnace_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01bc453-5b57-4de1-a1c1-e5c197c7aea4/75919719488.pdfIn PDF document text
    • http://tiredosutozol.atwebpages.com/spelling_activities_for_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/41103911429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ddcce54-9c3f-4bf0-8b59-ba694fe67697/possessive_nouns_worksheet_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d0bd82-51e5-4ae0-95b5-6a6268e89a96/tabla_psu_ciencias_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/bangalore_days_english_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/density_calculations_worksheet.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_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 5412 bytes
SHA-256: 531256b4942890fff861ac323a53cf2da2b680b1e3df9e8b6ca1430c3cef758f
font_01_sfnt_off0001163a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163A 11376 bytes
SHA-256: ed723872a17bc632ea4bae62daa9f2e105df3538317a6c03ed24ab78a33f6386

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