Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccfcf010244957b…

MALICIOUS

PDF

74.7 KB Created: 2021-09-26 11:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc62cc221e8cc358d5d7404bab7dcea0 SHA-1: b818977a8ee577e996815fa4c52812d368140a98 SHA-256: bccfcf010244957b9d5e0af4ada12abec916868e9d3845fd251d928c56586219
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious phishing malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links pointing to potentially malicious or disposable domains, suggesting a phishing or credential harvesting attempt. The embedded JavaScript likely serves to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://zeci.nl/im/image/fuwinumunitisirejasowexu.pdf In PDF document text
    • https://edusfera.pl/upload/file/vapifagapug.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/xekejidatupod.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/dolizo.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/bogizisizuja.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/notisiwike.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/37776365966.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/38713492976.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/3999701216.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/62208900557.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/karekobevurujixapalapiz.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/60885752386.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161344bbae4e8c---24284310625.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/32189769745.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/mikel.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/banuvogo.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/82914625569.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wunemovazonuragama.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/44089117957.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/2723587308.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/medudelupenisegu.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/421150998.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7532a5c8b5e5197469f9da7c75a77cba/guwevano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=adobe+lightroom+cc+2021+crackPDF 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_off0000bd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD00 17808 bytes
SHA-256: ceecf2718f92fd34499eab734b9c7b8a1574a3385fc823524088374d2f7d4913
font_01_sfnt_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 11052 bytes
SHA-256: c6578e6cd7ba7e57ca731af1b64f6caeb737c9e8b2bbda0ada117f0e86e34da1

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