Malicious PDF — malware analysis report

Static analysis result for SHA-256 72df5bc329ecf70d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 22:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af931ffe132fba5266aa4b4e798d8a83 SHA-1: f017c77ae494f9308ac885d1963c332118466c14 SHA-256: 72df5bc329ecf70d16e036e6182bf7cb2bf42a6c446cca644c1deb4d84e34b1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs pointing to other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on disposable domains, suggesting an attempt to obscure the true malicious destination. The presence of multiple unknown-reputation URLs suggests a distribution network for potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://targhevaticane.it/userfiles/files/6903578370.pdf In PDF document text
    • http://industrialsupplies.pk/userfiles/files/86910442573.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/3605964513.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/24212430608.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/keledok.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/tonijuxuwowaza.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/28870909640.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/tiwukenetudepuluk.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/purejujitofezurovis.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364ba07aa81.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/zaxefesibevixobefavojofo.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/80428917189.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/dezinomelap.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/tijefumaxejid.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/fodolug.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/nonexaxedesomatojiwor.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/70654123043.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352165d22a0---39399924930.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/jiwelakaxexelawafe.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/daxerenevogujul.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210913_7F3891D41780A4C1.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/mumakotapubimijawaxe.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/83748844415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hack+version+of+hill+climbPDF 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_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 19392 bytes
SHA-256: efb11e938127db2b6e98761463b29d4ac9f33bd377b0af8bf6d2667918ab49c6
font_02_sfnt_off00012c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7E 10792 bytes
SHA-256: 3d57a0387cd963bcf422885b5c38c62dedf142f837173f387d8a6fb1dcd5bf2e