Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64e8b29bddd0509…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 01:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55ed5e5505e63e7c848d76c5efb7077a SHA-1: 4f1f7b18b87ceaa2462637ea953ef97cbb838917 SHA-256: e64e8b29bddd05092a595f28435e471bfdc0c894b20f4be03b1a2adb3b2bbf49
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external links, many of which are hosted on disposable domains, and a heuristic firing for a visual download button, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://iucecb.com/files/file/lojafegazuvejapotak.pdf In PDF document text
    • https://teater77.nl/userfiles/file/pukedosozopurox.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/tadodafatisutisopi.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/96305436527.pdfIn PDF document text
    • http://fitviewer.de/files/file/8313884513.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/42859260470.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/vovoxavigojire.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/15955993105.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/68513264604.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a1e2030e---karujozoxolure.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/pewowujazali.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/86540688602.pdfIn PDF document text
    • http://pactolous.hu/upload/file/pulilapekutikojarexutaj.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/murexipi.pdfIn PDF document text
    • https://businesslife.com/content/files/78557993378.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/tafile.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133e0e00f9ac---61744625918.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/nilevisonujugafuluzevafig.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/sewelafa.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/bideperaxikag.pdfIn PDF document text
    • http://industrialdevices.in/uploads/6698213822.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/gatopuwogufixonazexosopem.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/jirujuzafafive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=garry%27s+mod+download+pcPDF link annotation
    • 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_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 10628 bytes
SHA-256: 95a419efdf2246a916ab1fe2ccab65dc5dabca8b70c31f13fede1d3aeea846cd
font_01_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A4 17704 bytes
SHA-256: 28129c100e1731b93e592be0fd9255f47b2a0c69fd14a7ace9261219f0d3f194