Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a93123b0905de7…

MALICIOUS

PDF

54.6 KB Created: 2021-09-20 21:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d38b38fd7eef7c2dec55f5dde7810a49 SHA-1: f438b48874b6ece31af7df1f17cfb28402fc7233 SHA-256: a1a93123b0905de7fbb4902da4f92fd170d528009cf2a86d7da7d424562522b6
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, including one to an algorithmically-generated URL, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8307

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://cructi.ru/uplcv?utm_term=nightwatch+season+1+episode+2 PDF link annotation
    • http://wawabed.pl/uploads/userfiles/file/zufowadajowijo.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/xipuvozezopuzavavafetuwel.pdfIn PDF document text
    • http://yanartextil.com/firma/files/lapafepabodojuvilixiroxop.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/nuxusabefowato.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/mipiginunexalurose.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/jujiduge.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/66378982504.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131707dd19b2---94863312196.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/5296741635.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/82323565004.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/vamujatij.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/lufap.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/86d759ac3055b536da40164aa9eee0ce/9118096344.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/81995165589.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/kunakebudeloz.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/51269164140.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/nixizirifabetunewoxonej.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/99312742503.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/rowatesowumap.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/risokasotoxoz.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/nejunov.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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