Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b364147c6e9c7e…

MALICIOUS

PDF

84.6 KB Created: 2021-03-16 03:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dba6dfcfb43f46de1106814648d63d6d SHA-1: 705c2c82d39708f65dd00d34415aa5ee9e99c3cd SHA-256: b6b364147c6e9c7ec0fb0b8bdf85b439d38a60c977fa9dcd35a07e7ada34d2fa
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 0.9997

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://midufefew.ru/123?utm_term=chefman+sous+vide+user+manual PDF link annotation
    • http://zixudivibudizu.scienceontheweb.net/balanza_de_pagos_estados_unidos.pdfIn PDF document text
    • http://namunogetivij.iblogger.org/70280970640.pdfIn PDF document text
    • http://nozetexopawovu.iblogger.org/vunokilavirevipew.pdfIn PDF document text
    • http://pasadurasasagi.medianewsonline.com/interview_questions_on_java_for_freshers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456140/normal_601aaf08dee18.pdfIn PDF document text
    • http://nesibobivugo.iblogger.org/online_english_aptitude_test_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_60210a58656a2.pdfIn PDF document text
    • http://debesur.iblogger.org/cast_iron_foundry_project_report.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/anisio_teixeira.pdfIn PDF document text
    • http://xuxisozolawub.22web.org/lapejasufulaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_60255c1be205f.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/rosuzewok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wanabovemuzume.rf.gd/49725089690.pdfIn PDF document text
    • http://kaborox.rf.gd/blackbird_tablature.pdfIn PDF document text
    • http://redifigikutusoj.myartsonline.com/29901956910.pdfIn PDF document text
    • http://guridej.epizy.com/61414608823.pdfIn PDF document text
    • http://jodirexefakevub.rf.gd/ktm_bike_full_form.pdfIn PDF document text
    • http://luzawuwu.epizy.com/kpop_idol_quiz_2018_answer_level_9.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/curriculum_vitae_template_for_graduate_student.pdfIn PDF document text
    • http://kogawazer.epizy.com/e_collar_technologies_bark_collar_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/banerji_protocol_for_eczema.pdfIn PDF document text
    • http://dakovupogoz.rf.gd/18255287538.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_off00010ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 5112 bytes
SHA-256: 3a857001200f0f3c380d998bbcf21dbc95debaa6de2832a8c925224ee349b1e2
font_01_sfnt_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 11696 bytes
SHA-256: 8b9f7561da1386070b761b1fa3d9395ac40af6de719ee5167e9b86104ecbad1d

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