Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b233e26a1ce4a4f…

MALICIOUS

PDF

76.0 KB Created: 2021-09-11 23:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 924bffba2b3f3b6933ec0bc6f10e6c78 SHA-1: e4976fee1f9a2c45f51ef511871d2c74addae07c SHA-256: 8b233e26a1ce4a4f637512d404385797cf40d7d5ec85d0cd8e988584f975d2f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://heatexchangersolution.com/upload_fck/file/2021-9-8/20210908032244324119.pdf In PDF document text
    • http://snap-drone.com/userfiles/file/20536303399.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/64444073682.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/binunaxavaxub.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/buteleluvogujenabilumub.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/vevarujuzo.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/juzejegimugu.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/sofajaledaranudagum.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/66682041326.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/22472176841.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/sirevusopenemoli.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/rogixejesizepibako.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/52034115421.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/jopomukidojutevirekupide.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f973253375---3507035773.pdfIn PDF document text
    • https://pixel.bg/img/file/wutip.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/64486735851.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/rokufokewusagilewan.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/fajilo.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/motefus.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161365c52292d4---liselusawuj.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/86013825806.pdfIn PDF document text
    • http://dhf-china.com/d/files/25383504012.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/zivunixop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=7+letter+word+beginning+with+dPDF 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_off0000c469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC80 10376 bytes
SHA-256: 623cf2dee29a0a5033e98f931d6dbec74c5357838b7dd8e579922127f34c98bb
font_02_sfnt_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 18084 bytes
SHA-256: 56abb69456387d3553a61bdbe4701d7ead4824e2a9dc2e22332e63ac823b2144

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