Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e470d59f311abe2…

MALICIOUS

PDF

78.5 KB Created: 2021-04-04 03:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 19fbeafd30928ffd2aad16673b0bc4e3 SHA-1: 74629f6292f3c2380d4866f4c0b5f37bff94d671 SHA-256: 6e470d59f311abe2947c3ed9b4032a72142900e34ef857903570ede1ed848a00
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary malicious URL being 'https://ponafet.ru/strik?utm_term=how+to+teach+reading+to+students+with+dyslexia'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://ponafet.ru/strik?utm_term=how+to+teach+reading+to+students+with+dyslexia PDF link annotation
    • https://cdn.sqhk.co/goxobuve/gWFk5GS/multiplayer_driving_simulator_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zutigaku/hifhilA/4th_grade_sentence_correction_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • https://cdn.sqhk.co/doparibi/jhCrkjc/brain_uploading_machine.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/falufusu/dobolemaxaponujaloji.pdfIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_18208cad466e4edeabf73b8979ffd39f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegebunov/16154312701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db4b592f-fa42-489e-8d9d-6d732dd7aca1/sonaxowujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d16de4-5a79-45fb-a71f-9eb64cb6bbf0/craftsman_2800_psi_gas_pressure_washer_with_honda_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f455dbb7-fa2f-4ea6-b35c-8030ffe8bdff/first_aid_qa_for_the_usmle_step_1_2020.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_6f7342b81237441fa67611260ccae6db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guvovigo/vocabulary_workshop_level_f_unit_6_answers_choosing_the_right_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9332fa-8eeb-43c6-96a2-8e9395deac2d/xipumedeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f625c2-5974-4f72-8c39-6e9146a45038/descargar_diccionario_bblico_hebreo_espaol_gratis_para_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/union_budget_2018-_19_in_gujarati.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/rotuleradopi.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/boril.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/84683752305.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_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 5424 bytes
SHA-256: fad58421747670220347bccdf59f2fd8412979483eda6c11819c0f2e7d333aa0
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 10904 bytes
SHA-256: 757b4c64df352a681adb9fda74baf72593fb6daef16c626116f997aeb452d163

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