Malicious PDF — malware analysis report

Static analysis result for SHA-256 688e127789fc5342…

MALICIOUS

PDF

75.2 KB Created: 2021-09-14 01:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79a64cfa4c173c16218865b2edeaf1b1 SHA-1: d9fbf55dd7b9e99a112573daba731e6c94c8273a SHA-256: 688e127789fc5342fddb799e1705e46c57c6b9480787bbbdcfda5f0eb9822ad5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or conduct phishing. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=kinemaster+pro+for+pc+windows+10', are indicative of a lure to download potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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 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://coretry.ru/uplcv?utm_term=kinemaster+pro+for+pc+windows+10 PDF link annotation
    • http://airelimpio.mx/img/editor/file/wasapijepetiru.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134677747de9---fetapasetozu.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/99945940827.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/53194051331.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/kedinovikipisuvoku.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0d1201b5486e5a3ec762c44f6f72dad9/38481337018.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/68057995458.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/nuwilovukejisowajaresoben.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/pajimofedizivebezigoxo.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/99741130265.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/58218314781.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/wugigugovabamesidoxo.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/gewopixabetuwodixajafu.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/6811420336.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/xuwere.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/suvezofuwigokedosade.pdfIn PDF document text
    • https://mar3ol.com/Files/files/kibatebapupikusid.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109020522051181.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/2192998864.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/zidixujufajaluvogikosiduj.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/rasawobejimejiwan.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/15553772173.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/tamodabefemeteravavula.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/pinokosufujowiwalamega.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/73865570735.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AA 16516 bytes
SHA-256: a4af6514f7ad8765e9734a6758d6e756dd5b635dcc15079dfa386bfb9a65ad6a
font_01_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 10984 bytes
SHA-256: e2c24a721f34abadd12b9fe400b537bb3be7f25d3af9671bf85f9182da86bd47
font_02_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1