Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea52ec47eae6dab…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 14:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 062ece632ee6d8a09dffd0df58f00b01 SHA-1: 6311829a6a75beda3b6af4da3c2ef27bdfbb4dd7 SHA-256: bea52ec47eae6dab6f5537004d653694ff6baa6b1cc8967047b03162fdba56fb
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, indicating a link farm designed to obscure the true destination. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and numerous embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://sinojjacob.com/userfiles/file/19343560462.pdf In PDF document text
    • http://denprokhorov.ru/images/file/16752061799.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/tafafuw.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/90133704830.pdfIn PDF document text
    • http://kesifveotesi.com/files/joxamubibugikuluxanexepow.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/48459623737.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/97228337126.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sijemadakejezofano.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/1987538006.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/31147554037.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613e597f6d634---jesakenij.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/80058299895.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/duvolamajipevib.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/zaxozisafit.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0340d79bf---derifatimatapoduvavatow.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/25432339652.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/64018220063.pdfIn PDF document text
    • http://i-physiology.ru/upload/43256999347.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/4054161492.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/57071983912.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/56753074993.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/vatifenoxiwozagup.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/bubalupugaxukuledutaxusu.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/sonixepi.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/zipafakanolorasemira.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/bijizawafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=keyboard+background+for+phonePDF 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_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 16988 bytes
SHA-256: dd592f948ea80935121e8549ffcb5ab4f5b0b824d477694b89c9cd6120b44a85
font_02_sfnt_off00011e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 10932 bytes
SHA-256: 3b3e8047f9f85c684c4f0b8657d8cf331b44b0c65ec1a85f933d0944515bde9f