Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bffda93322f58f…

MALICIOUS

PDF

119.0 KB Created: 2021-09-18 15:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 666a1fb03b4e8b8b2b9e80ddb6f2b9eb SHA-1: e153c1678354954b9ca1fcbb50d7ac56be8492b0 SHA-256: b2bffda93322f58fbe0322d02bfc79b225de5b62c3a6927b09b2c654ee5b3309
74 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains a link farm with numerous URLs pointing to PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deceptive setup designed to trick users into downloading potentially harmful content. The presence of a 'download button' lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://loscogliodifavignana.it/userfiles/files/toxesokoxeraxa.pdf In PDF document text
    • https://toskov-yordanov.com/userfiles/file/21323112513.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/30991866987.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/muxaluzuwif.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/93810783.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/komisuwugisizanelizavabew.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/sidutonolu.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/noxefi.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44314692856.pdfIn PDF document text
    • http://polkovnik.su/upload/file/tutede.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/56608186556.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/tasadaxazurujilulufibu.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/91875160114.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/gozisufez.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/gimejupeb.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/vupule.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/lukise.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/lobamipumotufovitak.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/zuxebobonisuzonisabujifij.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/gexelukune.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613432c6d3d81---kufimanepo.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/4965273529.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/83618025545.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/42388809299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=redmi+9c+miui+12+updatePDF 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_off000166df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166DF 10620 bytes
SHA-256: 28524266064c78d20c14a12f6d3493ed5294a54e81d69af405ecbaf8bd866dc5
font_01_sfnt_off00017f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001975b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1975B 20284 bytes
SHA-256: 8efc8c2e4c937bb38a1567a7cc3b82e4c0db4e3dd9865460e5b2e672d6882606

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