Malicious PDF — malware analysis report

Static analysis result for SHA-256 24db35940f40b1f5…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 06:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a7259863064ee0573365fe8aca704d1 SHA-1: 0a2ee68127cd9c790eb5272462cde8f7d58e7f4d SHA-256: 24db35940f40b1f5b9655fe102cc0350bbfbe7a8437eacb9e606c01c9342e9a2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The embedded JavaScript likely attempts to redirect the user to external URLs, such as the one found in the PDF_URI heuristic, which is disguised as a software installation guide. This suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://drafthe.ru/uplcv?utm_term=installing+android+on+virtualbox PDF link annotation
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/sedetonujapumu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/51442999740.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/26457945520.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/87239748821.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/rutakewelivusaxig.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/wuzawopotafaxuzuso.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/47806082535.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/jiwedezududumoviki.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0c4c66566c75b3c659060e7a50492585/81339375318.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/43374990135.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/tajoxexozaxakomarobiwozox.pdfIn PDF document text
    • https://linker.tw/files/debofikipa.pdfIn PDF document text
    • https://servicepapik.ro/files/varebowefavutoxuxo.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/71511398338.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/42315148867.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4082f5a9---muxoje.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/gugununananowajapifi.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/73486595674.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/tofonibozen.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/79411344285.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/jefuzetitifag.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/8117310763.pdfIn PDF document text
    • 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_off0000b2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C5 10648 bytes
SHA-256: 0966e76bca70281dab88cfe30adc17f11f585fecfded42c401c24945d20c8b67
font_01_sfnt_off0000cb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 16932 bytes
SHA-256: f6eac7557db46f3818fe16fc42e18fd97d968020bbffcf8293465c52f0d03e51

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