Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b80af8a274e5804…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 23:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 72751400eaa123b2a33f0ef893d57165 SHA-1: 62338ae618bc2a0de3ecafa7936c020f2932b1b8 SHA-256: 2b80af8a274e5804b12df5ee3c294185bedc810664c18c82e798af6644ed0fde
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 part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=android+screen+turns+off+too+quickly PDF link annotation
    • https://digireg.at/upload/138805982.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/bonanewagiruvawovolitew.pdfIn PDF document text
    • https://stormester.no/files/file/36585072527.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/36679928183.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/gezojin.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/vinufesikozonelok.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/xonezaxidesoretux.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/devosisinufavebeb.pdfIn PDF document text
    • https://isosklo.cz/uploads/2253478297.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/golilezefal.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/79314090718.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/siradidazonawiv.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/41861308293.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109280943395357.pdfIn PDF document text
    • http://csp.hu/editor_up/zigereluximuvabej.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/49ee8ec99a299c6d9c437cf0cd3cdbc5/72608181280.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/20199167808.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/26869318390.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/2331266794.pdfIn PDF document text
    • https://netpage.info/userfiles/file/zufusepez.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/19525391305.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/wubarozazuvizu.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_off0000b050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB050 10740 bytes
SHA-256: 181dab8fe8f304d036b7f0fe720f433904f66afb78f5f07816407472811e1b70
font_01_sfnt_off0000c903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 15400 bytes
SHA-256: 737dfd6d96c22613e202eb39522fae0f3c57ba6739f44f8bcb9e0084978b1594

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