Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db1f3afd62f40fb…

MALICIOUS

PDF

86.8 KB Created: 2021-03-29 13:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0dd1d5bb92c86e42eabaedad2637d6a SHA-1: 49d3dd4f6c04c5c689885c2953f4b80205552d27 SHA-256: 9db1f3afd62f40fb951b62e319aefb8f900af78dd839004dd521f8c8069ee241
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=effective+counseling+skills+pdf
    • http://susobokilodos.iblogger.org/20101143794.pdf
    • http://varesazu.22web.org/algebra_lineal_para_estudiantes_de_ingenieria_y_ciencias.pdf
    • http://look-hotel.com/10846632252ibdmr.pdf
    • http://virnet77.ru/nationwide_retirement_loan_formsd8kx9.pdf
    • http://tularafujebok.iblogger.org/agent_vinod_movie_songs_pagalworld.pdf
    • http://mirror-x.org/1588613616739d4i.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_a096ad01f04d4f30bc0a57b8bc05c240.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a55a6669-e94c-4cf5-ab99-17e2a38b270c/88766115847.pdf
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_8a506654453c4acebddf368c70d5bdda.pdf?index=true
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_4f82f4802bcd4c2480e0f4fe35620422.pdf?index=true
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_938183912b75428abb707c60969e6cf0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/12f83d89-3850-4ea5-a652-9cb53ca6eca1/dialectical_behavioral_therapy_book.pdf
    • http://muwodedera.epizy.com/how_to_write_dialogue_for_short_film.pdf
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_2ad5a33943a24272908519bdafb74ef9.pdf?index=true
    • http://tojopoxirer.rf.gd/37850652643.pdf
    • http://pumifobivo.epizy.com/mixuxiwigasotevoxi.pdf
    • http://nojekakanafigi.rf.gd/savenil.pdf
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_4da90acf0bef43b2bef47e8c9a1ca648.pdf?index=true
    • http://zonusaminotupe.epizy.com/teacher_s_guide_science_grade_7.pdf
    • https://uploads.strikinglycdn.com/files/4df8d43a-fe7d-4351-baa6-426488237903/84780257586.pdf
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_45cb20573a8549a5be1061f3e712532b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d60b6f3a-c7f6-43a4-8a46-c6cae5b13e53/dd_3.5_duskblade_handbook.pdf
    • https://49884795-3b66-401c-adaf-b59e999553af.filesusr.com/ugd/8bd6c9_cbc24fd128714dbf970f53d7b60b603b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001167f.bin
fade7669c0db86d4e519be98718cab7bd40251f3bafb7f918c5686bb9a796c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 5096 bytes
font_01_sfnt_off00012807.bin
2561a3bd831507c1e6140d6e3ac0c1c5e63af81aee26718bdc1ab0498c647d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12807 10992 bytes

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