Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ee6315e68a1e28…

MALICIOUS

PDF

67.7 KB Created: 2021-09-25 23:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a16daa100070f8027c99405aed188bd4 SHA-1: c692a49757ac8b5b8e281361763bb60646ce183d SHA-256: b7ee6315e68a1e2885edf7d7e28ca0499e1111fb9740cfebd0a06ba19eb067d2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The embedded URLs, while many are marked as benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8b5dc8b2d114e8119bcf6dc9ab82ed55/mupukimuluwadapozew.pdf In PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/lofiwiwamotazizasuru.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/dutovomomezofaxufemes.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/wevimag.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/jilikigisowabijubonavi.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/pifotobewufulonujuvez.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/75695393183.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/xozujoxo.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/zaposujowilugagejojo.pdfIn PDF document text
    • http://vaynhe.com/upload/files/59718137748.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/23835780005.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/31442620630.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/59938222155.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/xobojatibavifibajirek.pdfIn PDF document text
    • http://exim5.hu/_user/file/zitukiso.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/kemolipetasigasim.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/powodob.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/37405125133.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vijojom.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/votezezirar.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb506bde3---rerakevonudubosi.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/36662960620.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/88580775615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=f%23+scale+guitarPDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/43592431704.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_off0000b0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B6 14868 bytes
SHA-256: a61c497fcaa2a62ac5a197c8894118dc3058980742ca9b5525db4a10492e8449
font_01_sfnt_off0000d5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 9052 bytes
SHA-256: c2b8dbe43b4eb35175bac665517eb0c79c39d17d91092d9b7f24dc3a7abf91c1