Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc4fc5dc6ae1964…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 00:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3440413b23bc28a2fcc3d3ae7502c2a SHA-1: b6e4a2ab14c2387c67139b9d7857b945b95ab80d SHA-256: ccc4fc5dc6ae1964d10e0b0bc1c5ebb4abeadfbfcba628008e566f7c88fca5c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript, indicating an attempt to execute code within the PDF viewer. The PDF also acts as a link farm, directing users to numerous external URLs, many of which are suspicious and likely serve as lures for phishing or further malware delivery. The presence of JavaScript and external links suggests an attack pattern involving client-side execution and redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://bigcool.net/webroot/img/files/28185895036.pdf In PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/sazikav.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/movojosasulila.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/47844173228.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/rokixitoxerugisubar.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/juzexanufu.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/82880508653.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/dapagovelisilibewivipizu.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/kozoxorosuro.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/fgafjuh5kk0sub2vo693n447k7/fopup.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/63184668481.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/26703244420.pdfIn PDF document text
    • https://mahae.hu/files/files/39714408317.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/15735030901.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/tikuwimitezidule.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/14265470369.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/47609310034.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210906_231409.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/kekonediwup.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/jivopolu.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/61137478296.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/1eb24e9a1d13fcc1023cc3f2f55bca29/senenor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=wrong+turn+movie+tamil+dubbedPDF 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_off0000c390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC390 10720 bytes
SHA-256: dbff6dc7f583f1cc1589e846db990d49571f3662bed893fff9120e332bfffdbc
font_01_sfnt_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 20880 bytes
SHA-256: c42ed13bc05c1fc120e329da801225044ddf98e7e438f0b5a8437aeb0bd0344d

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