Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a71bd3fa7b2da1…

MALICIOUS

PDF

77.5 KB Created: 2021-04-26 14:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f010fff22dd7a8d16068229a3b53b512 SHA-1: 9a20206f9ac8b3d2cf3a98b1d66c18b47129340c SHA-256: c9a71bd3fa7b2da1a63c44ae0f61ba22f46cd453dd665594421cc88874fb3019
186 Risk Score

Malware Insights

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

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 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.
  • 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://kuzutuzo.ru/strik?utm_term=audiocodes+mp-114+ata+manual PDF link annotation
    • https://cdn.sqhk.co/vemetafije/gijOpjd/duck_shoot_game_toy.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/iUOMcZr/adventure_escape_mysteries_the_covenant_chapter_3.pdfIn PDF document text
    • http://nosumiva.mywebcommunity.org/intravascular_complications_of_central_venous_catheterization_by_insertion_site.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/wolokobisoxuxuriwi.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/ihdKfDE/93073232333.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/repakuretuwevewawe.pdfIn PDF document text
    • http://lurubalopare.sportsontheweb.net/algebra_grade_5_worksheets.pdfIn PDF document text
    • http://volulolusawaz.mygamesonline.org/sample_accounting_finance_interview_questions_and_answers.pdfIn PDF document text
    • https://zamigalimigarub.weebly.com/uploads/1/3/5/3/135326483/8370271.pdfIn PDF document text
    • https://motikefivenigem.weebly.com/uploads/1/3/4/7/134709332/borizupor-vukifaxitumutim-favipelono.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/wgegijh/azamara_quest_ship_details.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisunez/GghZu8p/dodowowejo.pdfIn PDF document text
    • http://fubikopelemom.mypressonline.com/curso_de_marketing_digital_online_gratis_com_certificado.pdfIn PDF document text
    • http://mobutadaxez.medianewsonline.com/vehicle_damage_check_sheet.pdfIn PDF document text
    • http://vosalax.22web.org/osteoporosis_elsevier.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowomazo.epizy.com/fowarutidixi.pdfIn PDF document text
    • http://pajuzipoxebemo.rf.gd/mudanisanata.pdfIn PDF document text
    • http://nanaxidimidi.atwebpages.com/wikanizep.pdfIn PDF document text
    • http://ligekasuxube.onlinewebshop.net/pofowisijesupalebinitegef.pdfIn PDF document text
    • http://jipinasin.epizy.com/can_you_search_a_scanned_document.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_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 5284 bytes
SHA-256: 413285847dc6402657e651a5d5d3e6d46d75fdb255cc1999a77196cef18b982a
font_01_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 10816 bytes
SHA-256: fbc277ab389e2a0115b291fcaa5d71e9a93b6cd8176d91aef2f9b2e28c8928ff

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