Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2d645e779a56c8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 01:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 54c6966e0ba841960a5045ef5397c2db SHA-1: def18f66d65a7a392b732f6b1f27ace160593b81 SHA-256: ed2d645e779a56c8aa9889bf273cf7a0d8964cf0e93f33cc1afc2f4e67fcb04d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=samsung+a50s+disassembly PDF link annotation
    • http://fosterfreezesantarosa.com/uploads/files/22544555571.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/53188259474.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/sajuxedidusamenovekonifa.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/wabuj.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/lirigifidodabomiwuga.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/kazuje.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/69095039966.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/87499198704.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/33201934915.pdfIn PDF document text
    • http://okvin.org/userfiles/file/46608824138.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/bomogofemuxo.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/vegeleniwegile.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d6f0771fd0268a8a5bc547e31d6ded77/49179257998.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/13364128782.pdfIn PDF document text
    • http://sun-tes.ru/files/file/vexodulefukaxu.pdfIn PDF document text
    • http://kmsenior.org/file/files/sutova.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/zufaronugene.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/37004382999.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/2716688087.pdfIn PDF document text
    • https://il-gusto.com/images/file/fowuxijalegedon.pdfIn PDF document text
    • http://yjccnc.com/upload/files/22154864226.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/wuleto.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/gunozir.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4503f3f5b---fafunujeludivijebufura.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_off0000bac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC8 10956 bytes
SHA-256: 59c53829ab2525e81f4ca27cd6fc0d95cb7898cd93a111c16c8bfd96a190b06e
font_01_sfnt_off0000d3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FD 16192 bytes
SHA-256: 5d180fe3fa75c0f5a55e26cc54dfd92d18ebacf7c80bd38067ffb3fcd685bd71
font_02_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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