Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf687e1a423fed2b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 03:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1fdc1cd1485ac6001a7a38903d34afe1 SHA-1: 169aa9f39bb570fd1ff4c8ad8097658c2f4d7cd2 SHA-256: cf687e1a423fed2b3da06e90d26b7f1f3c8322ec7a4cfa8a0fe223cd4154e3ae
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to obscure the final destination. The PDF's structure and the presence of external URIs suggest it is used to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://drafthe.ru/uplcv?utm_term=android+phones+vs+apple+phones PDF link annotation
    • http://nigerseedindia.com/uploads/jazawaduxirifi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/jilesujo.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/rigozu.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/30424637627.pdfIn PDF document text
    • http://holzbau-napetschnig.at/68530262129.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/35690639891.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/mawugifi.pdfIn PDF document text
    • http://congluc.com/upload/files/98769545920.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/kikozomadaligavedako.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c637702558---zimimuxekosokupovu.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/tutut.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/09/9586445317.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/tobuvitasowowitokixik.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/jarebigewefoka.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/xegumodasulume.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/25722417042.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/67762576615.pdfIn PDF document text
    • http://irinabailey.com/upload/files/pozaxoz.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/soxekulewawojiwasepon.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/devakun.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/faxavot.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/70374854290.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614375959ba69---runofupaba.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/fisufotonisetagukuraze.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_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 10436 bytes
SHA-256: 6eaa0409f7de83ce88bd2c1ad95b682366ca3d36dc83580998a128862e36d152
font_01_sfnt_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 17620 bytes
SHA-256: 853eb54317a4689bc0751a3ffd68718c3757b8fc50f1a5706e8d0c19a6426970
font_02_sfnt_off00012e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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