Malicious PDF — malware analysis report

Static analysis result for SHA-256 484c28e62c23a33e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-11 01:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cd5ecb07566e662a424be22dbd0bbe7 SHA-1: 7ea8ae68d1439c34d5020c7389171628a9037cef SHA-256: 484c28e62c23a33e156c6218a0b0bba994b0dd3bf44b7d4ae6ad4bb72c617b6c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the links or perform malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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.
  • 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://krisoc.ru/uplcv?utm_term=bypass+android+password+without+reset PDF link annotation
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/kimibifopudusabosim.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/kuziviludovenonowewesigo.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/54559293216.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/xutedidatejeruwax.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/39248183323.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/linusixekawigevufenu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7a1eed493---32574887766.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/71465850404.pdfIn PDF document text
    • http://iltorg.ru/upload/file/2073824925.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/20122385020.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/50059513330.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/doxulesufajakijezomireva.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/35213717355.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/japofulubakelododasi.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/33516860008.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/30470947607.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/63578187893.pdfIn PDF document text
    • http://17njl.com/userfiles/files/64069891592.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/pufumofonurekagofevezufef.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/15448150695.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/mefuranibuvanevatabipemup.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/32663462303.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/91451800103.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_off0000bf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF65 10796 bytes
SHA-256: 61bd2cbea03fceae7d7124aa7e05b9e7788465927151a80a2a448cb60bda6cf8
font_01_sfnt_off0000d852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 17084 bytes
SHA-256: d5888488cbb656a86a9f537e27cbb86457ebaaf5570917622f3bd19f75b7c937
font_02_sfnt_off0001040f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1