Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f598c8e9273527d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 00:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 794a87729b1c8d0be22e2d81b4e6f0da SHA-1: 1cd65211db60f73e1296479412ad6c02308d7ea6 SHA-256: 4f598c8e9273527d2912f4b2de234d245456775e811aa88646e3b2d1cb30bfeb
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=sword+and+shield+for+android PDF link annotation
    • http://elverum-revmatiker.no/images/file/54503747060.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/wetorevopekefakogas.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/20167757500.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/lozilukutoxugowerizud.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386ae7a1eb0---87832659866.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/lerelelojis.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/72992832569.pdfIn PDF document text
    • https://comfort8889.com/upload/files/biwozovusoduripefex.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/risigososapazita.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/wazipinavalivesomarula.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8c7083647---donetawetox.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/82427410903.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/mufabinubiloxifaxurex.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bezavu.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/31399941898.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/40361368452.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/95897485380.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/nugofapijevubogapi.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/lomidaw.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/gebigulawu.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/pazimolaxagux.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/52814586174.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/zitakifivuperomirojif.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_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 10512 bytes
SHA-256: 3f2a600c6c37d79e082d14fefdda6c4dba7f16faf796ba66833711d4a28d8250
font_01_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 18564 bytes
SHA-256: 6baa829cd327b81959e48036a0cff2f38b7d00131046e11a2fe7a31f62dbfaf1
font_02_sfnt_off00011e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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