Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1609b8a97a0401…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 04:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f1723589c076d981a56bbf3ef2627101 SHA-1: 31e96fee6a221029a99396cd6005b285414594e3 SHA-256: db1609b8a97a0401031d1ed2f7653cc2d4f50c090e815d92c5783c297fc961b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, 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 URIs point towards a malicious document designed to redirect users to harmful sites.

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://oniceh.ru/uplcv?utm_term=download+pokemon+white+2+version PDF link annotation
    • http://fteq.ru/files/file/pewiwawutuna.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/49576635617.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/29921840217.pdfIn PDF document text
    • http://chinahongji.com/d/files/70516365224.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/79929682650.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/wawojuzarolojiloxowu.pdfIn PDF document text
    • http://njxinbell.com/upload/files/wumutopupilulasazelenov.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140c98981c2b---zilifekobuni.pdfIn PDF document text
    • http://01host.ru/userfiles/files/72535083088.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/nidilinin.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/xiwobafopapafiw.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/refuni.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/49305100682.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/34483967030.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/6095316599.pdfIn PDF document text
    • http://twilaw.com/files/files/91498448352.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/bulaz.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/resavijisafiputofoliwut.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/37508793148.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/6448798761.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/79432875183.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/zasenezufizozewegi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/rqudjrpdhkt2dodhtqkk6vllmo/gizakar.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_off0000c849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC849 20536 bytes
SHA-256: c9b048dc4da4a80cc0eec80f7929d65552b2598d7fb249f4218ad2c0c5416ed4
font_01_sfnt_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001162a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162A 11024 bytes
SHA-256: c31b6bdac7aff90a58f41ad5cab7afc3a9cc95471615340e035d04771da8fe52