Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf29bd35cbe38e92…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 05:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d286a29fd254590c0bfc00b0a068fbf SHA-1: f2f0df72c27c4543553203f9786f0be419065ab8 SHA-256: bf29bd35cbe38e92e92254448191221716f8e17c75375609740987f9b3d0b25c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with many pointing to unknown domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution vector, likely leveraging embedded JavaScript for execution.

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 http://jedzenie365.pl/ckfinder/userfiles/files/wapiteregu.pdf In PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/64275536218.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/deritutivoworexek.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/simaxokudepuvag.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/liwurotoforerikizakid.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/bapapu.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/fakodojutatifabipo.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/44170671048.pdfIn PDF document text
    • https://trieurodata.ro/images/file/simulerixumamoperumedodo.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/98931301296.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19649453929.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/supewi.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/gizefi.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/mixoperagebagolem.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/wifelekivemipumidikax.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210905_543086C8B7C03E1C.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/26262027668.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210919_5B7C8F94B984B9AA.pdfIn PDF document text
    • https://pcetravel.com/files/file/62287671438.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5d4d70807905ccc4c963abd35c5c6084/90096571455.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/wiwuxafipikekevolexopi.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/tolekuwugudas.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/32453623723.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/wefamutonujonuretov.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362ad0b4681---laxuguku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=make+a+song+your+ringtone+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_off0000e0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EA 10676 bytes
SHA-256: 87bd58f1e515e11ca39918e301e0254ff84e0fe1bcf7b975953232255a7dce68
font_01_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 17856 bytes
SHA-256: 83d5b18b4e82881ea5fa8b7456f9e0c71a75d43e6b6deb6b3e41fe01d47cda53
font_02_sfnt_off0001277d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1