Malicious PDF — malware analysis report

Static analysis result for SHA-256 7323a26d7ead1dae…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 20:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6253c54126d3b3f66bf92807d16797a5 SHA-1: 8bcf27807bd0eacdbec5c1587bad02bf2a0421bb SHA-256: 7323a26d7ead1dae9de4eb4b7f9bcb46e1d403370e89482d2c9e4eb9680d396e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or scam attempt. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fresh-cherries.com/ckfinder/userfiles/files/73566995679.pdf In PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/xejakogefupub.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631757135_690f254d6a.pdfIn PDF document text
    • http://abwva.com/uploads/files/jidavazijuk.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109160453263165.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/18197171656.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/puloxodepetavuxusonixa.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/70016138968.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/91131555360.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/87174111101.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xalibuzawamek.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/bikixuna.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/buxarulikobejuborof.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/52421297923.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4a3a969db15932a9d500d32ebe2dea44/dekilowemisalowevexu.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/49180672489.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/93551341175.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/574561988.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/xatitasasaninubo.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/53997566506.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/novinofafapumaf.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/zimedopibaba.pdfIn PDF document text
    • https://angkagenap.com/contents/files/77241085029.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/visazokirizupubalebamax.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/patoroluwepaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gta+sa+j+cheaterPDF 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_off0000d5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 17284 bytes
SHA-256: 9f5b427406ce6d7ab8d60bb7fe0797bf7723d188d87dbae2844356a1796018af
font_02_sfnt_off00011a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A84 10132 bytes
SHA-256: e1e45155fa9f16f67ace63ac53b68c6f9d8440d79cf6c74497883e3dfacc8a2a