Malicious PDF — malware analysis report

Static analysis result for SHA-256 9daa8bd3357a1d93…

MALICIOUS

PDF

72.5 KB Created: 2021-02-25 18:11:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f94b840c105dd678f3e9f58f68844547 SHA-1: bf7873fd11fb1868fde931c8c64f019964066cbc SHA-256: 9daa8bd3357a1d938665e198af34cc2b1bde86584d8eebc12bdc7d83c06e1792
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which appear to be part of a link farm designed to direct users to other PDF documents. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous URLs suggest a malicious intent to distribute or redirect users. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The document body, though heavily corrupted, contains a keyword related to the embedded URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/wix?keyword=funny+vietnamese+ringtones PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389090/normal_6019c1b2485a6.pdfIn PDF document text
    • https://cdn.sqhk.co/duloputemab/eHijxgi/vopuzezivileles.pdfIn PDF document text
    • https://cdn.sqhk.co/kitatoze/cYhb7jh/xudagijaxinebix.pdfIn PDF document text
    • https://kuxapularutamux.weebly.com/uploads/1/3/5/9/135984678/c398ece8b68a.pdfIn PDF document text
    • https://sivikowililip.weebly.com/uploads/1/3/4/5/134599649/03761413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426271/normal_5fd7600522d2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375509/normal_600c8e23d5876.pdfIn PDF document text
    • https://cdn.sqhk.co/dojagomudek/u1emhb0/darawura.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/how_to_draw_a_turkey_easy_step_by_step_for_beginners.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/how_do_i_program_my_philips_universal_remote_to_my_sony_tv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vubelifijam.atwebpages.com/best_books_to_read_for_political_science_majors.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/android_sdk_tools_update.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/25300889970.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/60014117534.pdfIn PDF document text
    • http://siwupogogu.rf.gd/wolf_wall_oven_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/arkansas_state_police_accident_reports_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/cuales_son_los_titulos_de_credito_al_portador.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/fapejogasinev.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_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 5088 bytes
SHA-256: 959199ad409e78216ca5d060fc3422a4b424b980461e858616341ca5076b3aed
font_01_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 9764 bytes
SHA-256: 4883f457688d1bd01fce0db8665dc0963c945edd5ceadf6096ed41338523b5b1

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