Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24ffec2aef28bea…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 17:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 22a8709f482ae6b9253b0eb56e8cf399 SHA-1: deba85eebaa2a90e41638391a5c208d968761dfc SHA-256: c24ffec2aef28bead8a513e8234cc10e53eccc07d2af928e15bb45e6a6c40469
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 http://sushistoryus.com/uploads/files/73653792461.pdf In PDF document text
    • https://villanakarin.com/userfiles/files/zezuvorisimaru.pdfIn PDF document text
    • http://bociany.sk/media/file/gopepibobuloxutagowaxom.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/16832117132.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/sobobiwifujideketefodu.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/wuledumexizofokizepiwid.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/digojabezar.pdfIn PDF document text
    • http://www.77ice.com/upload/files/lopadekabexojipogiruli.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/225f14cbee7e3f6116a898c14fed27b5/7672655799.pdfIn PDF document text
    • https://kysig.com/app/webroot/userfiles/files/7816906328.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/zudakuruzubemefon.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/sikokisotoxut.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/63013708570.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/vivitotumibitusa.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/40495483568.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/68946779943.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/gepofu.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/suvinexapadevozixawi.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/kupebizukedijowomegi.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/pezonebid.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/bojeruliniwidemop.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/bividusej.pdfIn PDF document text
    • http://atomleasing.ru/media/File/7526903108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=luther+barnes+so+satisfiedPDF 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_off0000ae33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE33 15452 bytes
SHA-256: 7f75648d861efeeea36be74458325afab13fb601e359dc88116b81947ed88d76
font_01_sfnt_off0000d58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 10604 bytes
SHA-256: de4d2e8cc8b9a364033e72b2e804995bb0034831a1b11118efef55581de9626b