Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3669408d4a340cb…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 06:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b18a7f4c7aec68ce683bb27c2e05501a SHA-1: d4e71fb56008b12c45625b0412d609bbf3d7a953 SHA-256: e3669408d4a340cb58a7d1906211b47cb9d497110403376fb4fd943f1310f380
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=live+wallpapers+for+android+phones+download PDF link annotation
    • https://aljazeerahdrilling.com/userfiles/files/ralaxib.pdfIn PDF document text
    • https://kaparatt.com/images/File/26945356097.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/kanefexerunujew.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/41603058278.pdfIn PDF document text
    • http://yilip.net/userData/board/file/ponavujozekujijolupit.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/pakonola.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/lewarati.pdfIn PDF document text
    • http://apsons.eu/files/file/lezuluz.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/vuzik.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/bujukezojobajuzukek.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/riduv.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/nowimezosex.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202197234749.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/40586540761.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/mukifewowexoxonejodir.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/36534129177.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/7224727953.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/bozuzebikedet.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131c8388be21---javosivodonekoriw.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/mojuj.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/357150669613a5ac4f0eea.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/nuvugapubajewogidureseju.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/73005942979.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/21766383547.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/da10a16be804c36904077c73a5b7f5df/bajixesodumalujugebo.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_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 10604 bytes
SHA-256: 0db6576ff9ae5f6c503970dd7db89d70431ec6d300e24d37bc4fe77ba2b0ac42
font_02_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 18212 bytes
SHA-256: f712c54827dd491c96522e8a4ac0c38b3befd67c7626e1b7884afbc290c7bf3a