Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f85b96c36eae10…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 08:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46dc7878b4966ce6d8c5d28c3d3d9ad8 SHA-1: 010c8ad0519b57952ab2eda930bfcda9f23e131e SHA-256: f1f85b96c36eae1074436a594fa953d00933dd20324e4e6cb52f0f24c49ea925
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://barcelonacentromedico.es/files/galeria/files/62007324744.pdf In PDF document text
    • http://namngonviet.vn/user-/files/kozatadumalajokizakabu.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/25739679480.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/29634176805.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/95151054935.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wipuxefodedinolodetopoz.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/88986835274.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/88944183871.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/fafefij.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/21314247163.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/jakukuzovedum.pdfIn PDF document text
    • https://goodline.by/userfiles/file/tamokote.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/46902458446.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/93137759026.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/figonasabepafuto.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/2360162310.pdfIn PDF document text
    • http://tfforming.ru/d/files/26484703636.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/kiwaranolekisewap.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/gefejorifosenobowul.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/35053a6c51598d4cb0a1dd3501f30abe/warulegedubux.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/30276652427.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/fefikisifivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=4k+wallpaper+for+mobile+gamingPDF 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_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 10732 bytes
SHA-256: c04578273e4a3d6a1891af82dead98946dea9972a60ed5e3684051074090a713
font_01_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11535 17780 bytes
SHA-256: a6f41b301fdf671e1708506fe31de3f69696c1dca09cab8c57d4f2ede5108800

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