Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f497e9a676cc32…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 13:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5947b9be398b8e21d306f529b2cef3c5 SHA-1: 1c0cc39df0b9ba4b7bd4ef068cedb569c4f9b882 SHA-256: a4f497e9a676cc32ca08899d710d93fa6cf75351ebbb00e3d586ecae9797af10
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://reguitti-engineering.it/userfiles/files/naxakoduguvekobor.pdf In PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/90987668117.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/padabubikafege.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/11274951576.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/nimefowilawinaje.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/87250235226.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/renoba.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/gakidodorabobalurewigato.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/90672478713.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/zowuj.pdfIn PDF document text
    • https://akemi.ro/hirek/file/99311274380.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/94934473933.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/dixobuwotesexozereruxaf.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/89395994423.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/liteju.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/resibezuvodetusiridig.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/rufitebilut.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302dfc06a5e---49961314500.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/576015214.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614379024520c---81504066844.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/tazojaro.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/29750363102.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/posesuluzikupabavageg.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109161656012394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+gun+has+the+least+recoil+in+r6PDF 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_off0000b365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB77 17084 bytes
SHA-256: 9c1fd4c666fef8226c51c78be83331c743844b2a0b4e45053d15df04b532669c
font_02_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 10768 bytes
SHA-256: 5257fce14d60d764b051d000f0f2126af546f9a6d2668dd38cfec02bb8b4c3b0

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