Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cf6d0a0acb3719…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 01:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b2f9a14e97e3a6e64b09b59dbea5a8a SHA-1: 1180c7cac02eb2ce19f4e80e4a131454dca526f2 SHA-256: 50cf6d0a0acb3719ae95a134a01d2e03b513e8421bac230dc57c4fb7acfe0459
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links pointing to various domains, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data, but the presence of many embedded URLs and the high detection scores strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/372727c3521cc2af40ef32e5feca3e1a/lasedomowigefupomifame.pdf In PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/65586262478.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/widajuzaziwebubisabe.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/64459093693.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/davirutuzumuwusitudumix.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/25159007242.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/2414936862.pdfIn PDF document text
    • https://ubranni.com/uploader/files/javajeluremopedo.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/xuguk.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/vodaferej.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/ditujog.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/87598441696.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/17568592948.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/62701089584.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/23116251542.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/23616950806.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/91642546498.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/zizemomu.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/butatujesomirux.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/75649803170.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/xurenexabafar.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/72042560149.pdfIn PDF document text
    • http://happy-land.hu/editor_up/85113626475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=a+positive+word+that+starts+with+kPDF 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_off0000c432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 15912 bytes
SHA-256: 5307ee3eb0e3fe589e3a6483b07dd8affc1cbde551a4e367007339e3a5356ff7
font_02_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 10564 bytes
SHA-256: 7ef440bdb2c2f4037a45296b7a5d9ce272b44dcfe9e6e03a42d9870bf843834a