Malicious PDF — malware analysis report

Static analysis result for SHA-256 d630d74942f2eaf7…

MALICIOUS

PDF

75.9 KB Created: 2021-09-09 04:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d81f1dac0d1d85d7634b62c709b72e95 SHA-1: 505a2954707fc6a5412c2227c3c054fac9ed78a0 SHA-256: d630d74942f2eaf74717403fc22c060fc3e5f61e1c0f2695c089fc80b1a5777a
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to distinct domains, indicating a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, suggesting the PDF is designed to distribute links. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the primary attack pattern appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 4

  • 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://infrastone.com/userfiles/files/bavalilulu.pdf In PDF document text
    • https://alsultantrading.ae/userfiles/files/pefetilutupigafisisime.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/1557705887.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/24098282159.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/munoriwuxewe.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///2021972245449327.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/85369184484.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/vuriridebizemegevafo.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/koxesu.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/43842491628.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/bonepimata.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/27453530402.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/giteve.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/kelewelokubimeropibukidos.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/pukuzogefuvenujul.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/lodafolorivov.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/lapabubaravave.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/17682480802.pdfIn PDF document text
    • https://ever-progress.com/upload/files/lepuvawumiwe.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/38705268702.pdfIn PDF document text
    • http://www.andreapondika.cz/file/timonanag.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/fixomeresunoluxumej.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/63304974625.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/39218021973.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349ca0b0899---78524881618.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f423071c61---lobofosanezimil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+go+mega+mod+apkPDF 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_off0000c4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD2 10324 bytes
SHA-256: aac5c6b50152078052cb9a48ef414b36f2374b1c03c2a9aad402c82d4e360b60
font_02_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 17796 bytes
SHA-256: f4d9f9910e9f30d03af11d5db4b38399dba1f10465c81075fb436d4c70fed961