Malicious PDF — malware analysis report

Static analysis result for SHA-256 8512d4eb9556e6b0…

MALICIOUS

PDF

68.4 KB Created: 2021-09-22 16:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c43dac7dba8e5d912199aebe7bfec37 SHA-1: 9bdabc6c9b451be1f14ab8ca800822e1192f1e9d SHA-256: 8512d4eb9556e6b03ed0adf5a4e3178ad19a4582de673d9f802685515e800273
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one that appears to be a link farm designed to redirect users to download software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://pixomot.ru/uplcv?utm_term=kingroot+android+7.0+download PDF link annotation
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/ruwumugaside.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/2897717488.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/tegarujaxidukeza.pdfIn PDF document text
    • https://derfo.info/resimler/files/4390958896.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/fumudolo.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/mimojone.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/pesasabimu.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/75401090401.pdfIn PDF document text
    • http://chinahongji.com/d/files/zevazonaki.pdfIn PDF document text
    • http://trubaopt.ru/content/file/68010422065.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/xilez.pdfIn PDF document text
    • https://people11people.com/uploads/File/vunusawufipelo.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/22293636217.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/kulovunepememekajiwaxus.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/4735301492.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/numonurigekenutas.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/jarupelene.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/37474801059.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ab82a410ec825f232376819e384cf86b/jumobezijomewavobopol.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/16224552691.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/pasulagalipewuzaj.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/97990222420.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343642ee5b0---52123368006.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/nevopewen.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/dutosabojobasibajakof.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109041043324565.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_off0000b073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC885 14324 bytes
SHA-256: 1001bf436f9bdec0a37cf92175cac8a365230b39cee2acb94883c7b614b86f85
font_02_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 10440 bytes
SHA-256: 95c60b1d3211b4bbf695a5ab863edbf8f3d148dea0bb0ffc150dbc76bc7ca3e6