Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d209148fd95c45d…

MALICIOUS

PDF

76.3 KB Created: 2021-09-14 14:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 141b91c6062f3ac96b63794db80bdf05 SHA-1: ffa9977a6b80e40bd3783d18394661f557699294 SHA-256: 7d209148fd95c45dd2bb401acfcd923ea2782c1460043d71b4ddfcfad0c4472b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs and a heuristic firing for a 'download button' lure, indicating an attempt to trick the user into downloading further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lead users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://airzo.net/userData/board/file/kulun.pdf In PDF document text
    • https://selispin.com/calisma2/files/uploads/kukabupotedimedexemo.pdfIn PDF document text
    • https://petikdaun.com/contents/files/zasifirazewamidurutebavox.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/51546122977.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/87575231867.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/pipepe.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/viwar.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/1576808469.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210908185305.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/67455706164.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/11037123698.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70304703483.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/tivugigokigitagul.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/88940067786.pdfIn PDF document text
    • https://pecintajp.com/contents/files/wawilulis.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a3213fa6f---22954964205.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/sopaza.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/sufegafazafasowew.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/2555609634.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/71934761211.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/34017709708.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/gawegosojewakexibajepaw.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/nekezurejonopakiwi.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/75505940015.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/8551205542.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/ruvovavogezurugilodip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+download+songs+in+muzio+playerPDF 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_off0000c537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC537 17072 bytes
SHA-256: 2e4ec67b583bab82f7934d1afc2b25a08173c49d198152548d7ccc8679bf1cd3
font_01_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 11088 bytes
SHA-256: bf869e870db035da077c3d16ff1005dff2b2890e64616c8d74644ce6672d2724