Malicious PDF — malware analysis report

Static analysis result for SHA-256 7600a641764e3fdb…

MALICIOUS

PDF

85.0 KB Created: 2021-09-12 09:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d33126cd4cbe721b5250cafadf6e9d7 SHA-1: 93df5ecd4270312d81fb23c9d5ae50426fc95398 SHA-256: 7600a641764e3fdb8fcdfdf2586bc6b5179a9bdc672d5c7e9691d278bb006d0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=muse+dash+apk+no+mod PDF link annotation
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/12515680885.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/zuzazirekejebiges.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/vozagev.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cabcbe6cc0---zukimabog.pdfIn PDF document text
    • http://newworldss.com/uploads/file/gakeborizef.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/vodesirijilubegik.pdfIn PDF document text
    • http://labsshop.com/d/files/pusogonifedepenajol.pdfIn PDF document text
    • https://redac.ch/upload/nuwixojewovum.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/21013917867.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/55132662825.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/fatejur.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/rirode.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210905221424.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/roguvo.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/84584351520.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/85431370250.pdfIn PDF document text
    • https://shunnasato.com/worotufifipizasowabufora.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/63626158100.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/34054771805.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/muzuletipetaporirezu.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210907_682EA43386F9BD9B.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/komose.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/purasisutijijanenapus.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/13054802656.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_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 21304 bytes
SHA-256: c7bf51e9196e91745c7e5e5e30221cb9d9eb0cc282f5efb47b4e46a61ce3c571
font_02_sfnt_off00012ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA1 10508 bytes
SHA-256: 8afd9a1901e4adf1567f4c1489d7e71d4eadae92b30bcd770cdea16c31e9bdcf

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