Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c6ac76b0a7fb2c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 20:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 71c19e7ea2f84cfe7f0120570780203c SHA-1: c0c501a5b6f88f5c73df4fa34a53f2cff4ca6de2 SHA-256: e2c6ac76b0a7fb2cb1fdba9a5e470fbf2bcb88109669e3cd9599267c17ed39b6
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it is a link farm on disposable hosting. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be directing users to a collection of other potentially malicious documents, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://senfina.top/uploads/files/fegidezuluwatepetijadum.pdf In PDF document text
    • http://open.ua/uploads/ckeditor/files/fuketumo.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///10426516577.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/28342133357.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/60093207606.pdfIn PDF document text
    • https://tekartltd.com/upload/files/61203947108.pdfIn PDF document text
    • http://cloverdiamond.com/file/jewud.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/losebesubodijopeminijava.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/pugogelolog.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/80022241205.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/94396707430.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/30553506578.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/41067547927.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/83763949971.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/97173233950.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e261d95d---89941957294.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/gilodamisevewararefipesu.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/11337874563.pdfIn PDF document text
    • http://centronegozi.com/public/vizelobefapufisav.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/83351875887.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/lotutiwegetuw.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/pavobudimoxo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346089d503c---41335276406.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/nitulojum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+a+android+app+pdfPDF 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_off0000e6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 10616 bytes
SHA-256: 490cb4f460f7fbe9caac859774c22e04d9adc54f88b0ae9a946e705137940bfd
font_02_sfnt_off000116fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 17784 bytes
SHA-256: 08febaaaf009d6b0b5a2021fc32190784825fef2781f7ccaf53509b4ac6fdbe8

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