Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ccb8ce35b8f567…

MALICIOUS

PDF

73.5 KB Created: 2021-09-13 13:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e43d7ece1d95b9a7d42d56fe36eabd32 SHA-1: 1b5c48474c209ea4eaa01505ce87102fc3b03b8c SHA-256: 10ccb8ce35b8f56726b67249c4673ef3abcde94227a77086382edb44b4c6ca9b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external links, suggesting it is designed to redirect users to malicious websites or facilitate phishing attacks. The presence of JavaScript points to an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://classiccar-jp.com/js/upload/files/21959583556.pdf In PDF document text
    • https://seedomoretravel.com/files/files/53112696509.pdfIn PDF document text
    • http://lgassociates.in/uploads/dezirimozarasoniba.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/rogekakunatafewaweb.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/81555312964.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70795752061.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/96826503067.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/10946527283.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090623472955.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/zoxesapavukagopeniwune.pdfIn PDF document text
    • http://juentai.com/userfiles/files/rovikonibaporug.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/dikufu.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/30840993482.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/77888083165.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/38142936453.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/rogofemagipagoraludafamop.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/lapunib.pdfIn PDF document text
    • https://bloomeng.com/uploads/fujunajotilitajemeki.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/potagobisodetotap.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210911_2BFD0499974FCE2E.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zewujiga.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/giwegejamijokog.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/41502405173.pdfIn PDF document text
    • https://actor-conseil.com/files/file/43187604354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+whatsapp+plus+%D0%B4%D0%BB%D1%8F+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4+%D0%BF%D0%BE%D1%81%D0%BB%D0%B5%D0%B4%D0%BD%D1%8F%D1%8F+%D0%B2%D0%B5%D1%80%D1%81%D0%B8%D1%8FPDF 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_off0000b19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19E 19544 bytes
SHA-256: 87e8643b9b3b4a2fe8a0ac4e4da1f41ab6348662411d44160ded7c93d9e0a982
font_01_sfnt_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 11776 bytes
SHA-256: 9887c39d8df9bcd18a8f88ff150e61f37f747b80e546a8869ccf4dcfe6bc7c91
font_02_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1