Malicious PDF — malware analysis report

Static analysis result for SHA-256 988bfd8a8264aa64…

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 03:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 895a37f32a8c53be6ed99f479dc5a251 SHA-1: a6679e5fb9887580c35b8aa1e30a5d82130c0d9d SHA-256: 988bfd8a8264aa64aa8381d26b180daf64629f322816bc02664b95e6a53dd989
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=gm+diet+pdf PDF link annotation
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/lotulifizalevepagefesovin.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631821893_e9d45e7ee1.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/pikarexukolirinolupef.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/tuxilatupun.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/45144049457.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/mejewemegake.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/dirubupula.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/68609529482.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/wakotokos.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/55017394715.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/gotisuba.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/sumupa.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/29908701137.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/befopapisipiwapitunegesip.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16310828242008635255.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/luses.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/80659783513.pdfIn PDF document text
    • https://cowik.pl/upload/26699310100.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/nivanutigopumolar.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/direrekegazufevuwararif.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/misivelew.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/24173709137.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/33344078782.pdfIn PDF document text
    • http://getvisa.ru/images/File/tejidipedorikiraki.pdfIn PDF document text
    • http://vodnik48.ru/content/file/8967154206.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_off0000bc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 10000 bytes
SHA-256: 1b2c4a79d05b4f9fee3999bda0d1c551597c60e0fa7b8a5559f1384f72cdbbaa
font_02_sfnt_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 16804 bytes
SHA-256: 04941d7eb34d1a8e8f76608c4c200fd24f92f658d6b5d18dbb3734cf477f75cc

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