Malicious PDF — malware analysis report

Static analysis result for SHA-256 c709a1ebe581cb23…

MALICIOUS

PDF

75.3 KB Created: 2021-09-28 21:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 759c00496ed14f5c62deb6107b444637 SHA-1: e90a9af8e0dc5e16291d79a3660d129b16257192 SHA-256: c709a1ebe581cb2351bbc649cf9950c650ae70495df5182bae4d62bbb9862fd9
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the presence of many external links suggests an attempt to redirect the user to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 4

  • 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 http://zussobrance.sk/grafika/dokumenty/61277831128.pdf In PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/bekagakakal.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a8c9003dd---kowodobuwotavu.pdfIn PDF document text
    • http://master-vin.ru/files/file/petoku.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/wemedakoxudiduzoxegilimo.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/vizemitomatizugavowiki.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/vazujoxora.pdfIn PDF document text
    • http://onlinevay.com/upload/files/zibarevojew.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/zenugijisuv.pdfIn PDF document text
    • https://senegal4d.com/contents/files/nipefamubanolij.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/xasimejosomonob.pdfIn PDF document text
    • https://basisnomor.com/contents/files/56903668908.pdfIn PDF document text
    • https://techlan.pl/files/file/61464532527.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/bubiwozozepitek.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210907170910.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/rikos.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/36115975588.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/98671116655.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/61755708875.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/14292597591.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1o110f6q2tohu2ph69kmckle8e/89422158979.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/tuwafewaxufif.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/62793925459.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/86079366282.pdfIn PDF document text
    • http://eventechsite.com/files/files/55915359212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gerenciador+de+tarefas+samsungPDF 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_off0000bdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB0 19148 bytes
SHA-256: f109ce8c49f09f638220a6a3d0ca1f65d42c6bec64be41057ea6399a48fe0ba6
font_01_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 10912 bytes
SHA-256: 3302f7c88b914ad57626fd6e6fedce3d4f9347bff5bf2cbb9085947c0b13d7ad

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