Malicious PDF — malware analysis report

Static analysis result for SHA-256 446c7090279ab7a4…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 05:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4260cc17c2ef8e21d14f5682ded996eb SHA-1: 3f0070eed912a542520bd40ce04495de8706f4a2 SHA-256: 446c7090279ab7a40f634895389d2dcca53b04afd24e1bbfa9e397dd3bb1f5da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a large number of embedded URLs, many pointing to unknown domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://psychologgia.pl/Upload/file/29208284692.pdf In PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/60403660157.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/piwakusakidi.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/xegisebegegobi.pdfIn PDF document text
    • http://bptramptour.pl/files/file/71434284400.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/1747486910.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/89970709029.pdfIn PDF document text
    • https://ferropula.hr/files/tonaxulitegupewenetagig.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0b40ab87d9a2f1ecd0e6eda0573b1676/jujurabu.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/55623773635.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/fibovasewekoratepuvevum.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/polowowogunif.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/60242743123.pdfIn PDF document text
    • https://orrizon.ru/images/file/96983955855.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/32770013190.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161326685dfd94---3044031256.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/76498404346.pdfIn PDF document text
    • http://minipit.com/data/files/wefomezom.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/tufazonenupebubuvijo.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/17047772171.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/43005394152.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/18129878623.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/79452597165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=piano+games+download+apkPDF 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_off0000cca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA2 18044 bytes
SHA-256: db5429f2327d5e4d1b217c71b4a393f0e1ece3462c04fa2e0c96cf42c21e6e32
font_01_sfnt_off0000fac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 10716 bytes
SHA-256: 8ea400a500a347c6e8f11a1b67d45368241cfea24ea56ae0201d27aab04c2a20
font_02_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.