Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffba7ddf2427e2b…

MALICIOUS

PDF

85.4 KB Created: 2021-09-15 17:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b3868ef446ee663e8ea930db5d2b1af SHA-1: a8c16960c2eb989155d20025033ee1caab569ab7 SHA-256: cffba7ddf2427e2bd80555c936069ba761756d7a43082471e2d1e2d355c085e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which point to disposable hosting and are structured as a link farm, suggesting an attempt to distribute malicious content or phish for information. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=wifi+hacker+app+for+android+that+works PDF link annotation
    • http://clarksville.net/wysiwygfiles/file/vibales.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/vabebowikilav.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/96243465655.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/9340877227.pdfIn PDF document text
    • http://torgoborud.org/images/file/62673085953.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/gugogaduzutodur.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/97387021763.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/tifiledarexewutokogowapav.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/95098277867.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/donajixutikosige.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/dogasegeb.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/96859285607.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/kusumomewemozawetomalunid.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356ece7c245---weboxilobasexazelixovemud.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/47430829124.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/pebifodax.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/kawapigefunesado.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/48068555785.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/zukobazojalap.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/12096911582.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/1843930474.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/61164904540.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/19095721335.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/getawufo.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/najobif.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/38685422853.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_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 17440 bytes
SHA-256: 418d44d2a5504c6119a57ec59447923045abbdb36dc046cf0875c865a98228d1
font_02_sfnt_off00012e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E03 10844 bytes
SHA-256: 9e955932c57cab20fcc2f0c4bad41d9cc13d3c68352d5a0eac82a32f7cd11d0f