Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f655dc5855ba33…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 19:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f724911de582e5d483ced8d2f88e26b SHA-1: b6bdb32d6b5a789576a1fcc59a8089a51068dfae SHA-256: 76f655dc5855ba336d65f9ed4ff292f0e0a270b0e09d7b0177b6931ec0771884
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or SEO poisoning attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for malicious actions, and the presence of multiple external URIs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://0575zl.com/userfiles/file/moriv.pdf In PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210905/file/16308577805840.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/bodugesitisunipope.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/lexiwuribufavamedakoduvi.pdfIn PDF document text
    • https://bunianco.com/other_files/File/14615151143.pdfIn PDF document text
    • https://adium.ru/userfiles/file/69381432151.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a87320ec51---98503909211.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/35654401983.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/zepijejabezoze.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/86556880208.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/jafamaregogugakexesaxik.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/ladoturupopiseles.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/suzikujajiredijugux.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/93694991020.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/22470880927.pdfIn PDF document text
    • http://cpils.com/userfiles/file/9902308514.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/genopiwunuxinakoke.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/kubalefeki.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/34945906503.pdfIn PDF document text
    • http://thongthien.vn/upload/files/fisek.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161354b9e4577b---55575465447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=belajar+pemrograman+mobile+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_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 18280 bytes
SHA-256: a3419d6dca2846dd9aa706c8734b43007158249a5ebd670b12e1ddc090b5ee3d
font_01_sfnt_off0001063f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E56 10792 bytes
SHA-256: 0a9a92e9f40ce768b902e0fe430e2d40d6b61c7888957a3ed81e28255edd15ee

Open this report in the interactive analyzer, or submit your own file for analysis.