Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca9fdaf213458fb…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 03:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21b11e1f1f2b2b55e0f0231a9f4b3583 SHA-1: 724c138ed6f02029c9c6f07dab6abf44ca38abf4 SHA-256: 0ca9fdaf213458fb6c826b324c0033be936d65ac6e8c941b1ce2f22fdb658491
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying a 'link farm on disposable hosting' pointing to a PDF file. This suggests the document's primary purpose is to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/30173039097.pdf In PDF document text
    • https://frisch.ro/files/file/bapuwonakewu.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/76513634232.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/dusekujuritete.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/xobupekekereduletixidugo.pdfIn PDF document text
    • https://windscrm.net/files/file/wadurusetaduxodezasekan.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/lalolalesikerim.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/lesede.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/kidoxitudixasapomu.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/mexarokomexurunodexul.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/pinitiwawivi.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/63532418083.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/narilibuv.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/kenageseninugafis.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/21594852467.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/kixewopejim.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/riwegavebufedaliwo.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/41318924577.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/31649266668.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/66186798244.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/40587408349.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/jelipizunofi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d321aacb---webolulakisovafek.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/zarapevugivopotaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=telugu+bible+free+download+for+androidPDF 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_off0000b9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 10552 bytes
SHA-256: 374e2e2ea65e198bedad62be26efcd922c6fc1d60610f30a9209b32d7f123eca
font_02_sfnt_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 17792 bytes
SHA-256: 5275372a26d76cccabb59f1b2b62baa1331401820da5e283bb8b4723dd6381c8

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