Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac1c08c483e2f9a…

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 21:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ce98786327573c97faa6a3f8b359104 SHA-1: 8c04a3e9ca6505b73767e132aa16dec5dfddbce9 SHA-256: 7ac1c08c483e2f9a457a8dfc3311c2a4ed70926656d02e39771bf78915f5dc90
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the suspicious nature of the embedded links. The primary function appears to be redirecting users to a network of sites, potentially for SEO spam or to serve further 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://medvor.ru/uplcv?utm_term=pc+and+console+games+on+android PDF link annotation
    • https://gemma.lucien-sv.info/uploads/files/613ac52ff1f2b.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/xejoxabugabufitikubobineb.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/15893776139.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/70852051366.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/91337857995.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/megolimorisimu.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/tawibitebu.pdfIn PDF document text
    • http://cartopack.be/Images/file/pegataweviniwipuwa.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/zujez.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/gekusavi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a7e935e1---4281791867.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/58651217653.pdfIn PDF document text
    • https://promise-land.com/upload/file/18150470579.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/88213149047.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/firoxupiwur.pdfIn PDF document text
    • http://jcpingie.be/public/files/nowawalobe.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/72904530395.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/lerivexisepi.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/leninirapalewava.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/30386247844.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/jubidosibebuw.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/tafowedam.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137d00908a4b---46950707482.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/pusufux.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/jegukovadobotajixozo.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_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 10616 bytes
SHA-256: e81fd1cab753af6357f3b0336618383d0ac2c24b09b136f2f147fb423e3ca3e1
font_01_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 17796 bytes
SHA-256: 23c48a006c2d5475ccc8b04800832d4f6f8f94658e6dab31f196604dc5196cab

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