Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2998f9707c6420…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 07:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8486de64b4d08e6720349e4c74cc520 SHA-1: 8eacfc87ab0dca87788052d628dd57714bf320bd SHA-256: eb2998f9707c64201bf902e3956f783500bd8e0824cff6efb4990a090bf3d4c3
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious. Static analysis revealed it functions as a link farm, containing numerous external URIs pointing to various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts, suggesting an attempt to distribute malicious links or traffic across a wide, potentially disposable, infrastructure. The presence of external URIs and the link farm nature strongly suggest an intent to redirect users to malicious content.

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://irlanc.ru/uplcv?utm_term=recording+voice+calls+on+android PDF link annotation
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/70344345337.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/jezijuzefiwotaserim.pdfIn PDF document text
    • http://agro-partner.com/Image/files/54512659068.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/zekajega.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/6736731939.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/bekivuzusa.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/mujujazifewegezozigi.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613cf44f9d628.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/nelalatalikid.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///nitetabul.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/fenerozisozof.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/jamexufa.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/govubuwisowuluba.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/26822451536.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/desipo.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/27043408838.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/wegisodilagusuzeja.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/vulikiper.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/tafovosapafeduwilawitegu.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/xezetatit.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///bixug.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/55757219882.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614256995fcc3---41004371880.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/warebepalipofev.pdfIn PDF document text
    • 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_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 17812 bytes
SHA-256: c056266901841b3ef02296a4df63bbdd6d51260cc52a7b922049db2acde12dc8
font_01_sfnt_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 10556 bytes
SHA-256: 06e1a18099c3b88cc50e2d50bef98f443c4be87f19c2e487bccf4b7362254cf2
font_02_sfnt_off0001307c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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