Malicious PDF — malware analysis report

Static analysis result for SHA-256 309e521f9093efd4…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 23:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe8f3723dce0a51cffa0a29da2e49d01 SHA-1: 0718046b9be136a100997283231f20e1ba5861b1 SHA-256: 309e521f9093efd46e81df350a4ff4df6a2ba9909d2630d95cc9b2745b7e098a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://medvor.ru/uplcv?utm_term=download+ldplayer+64+bit+latest+version PDF link annotation
    • https://www.nvsrolko.org/ckfinder/userfiles/files/22862831374.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/tokituluvedaxa.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/53327899963.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a94353c79---11875139319.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5b0d127f185af07320bb822bc92983e3/fakid.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/mipuzuvide.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/dubalokosinoxurewib.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/87133870186.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/bawixapajodivabipeditimo.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/vakikakuvozibugas.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/davagarawixekuvo.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/87944034266.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/36103647495.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/ximasalufozufigidu.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/46953114080.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/10513853134.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/2995546869.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/vimazureweburuduwad.pdfIn PDF document text
    • http://elskenecologie.nl/files/64474021951.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/24919720647.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/26584884869.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/44299318957.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/wutabakorafevasojojojid.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/xijovavom.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109030316371086.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_off0000c900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC900 18508 bytes
SHA-256: c5cd99ce20e41dbce7df3a7015b01321b60c0ffe91b44050ce7f988098cb63a5
font_01_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FF 11040 bytes
SHA-256: 79c7b0ba8b479edd8cd6fd9282aa0d3ce6a01737bf9d3a70f197712dce015f5d