Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b6ecc051701b9d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 02:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f4165a0e184fd833a794d8b22e38816 SHA-1: cfb8d047ca5e45bc39943bcc5581d0f53338b74f SHA-256: 80b6ecc051701b9d1e486ddd3b873dc8459666378bff5d121b278e5ccdfa5fbd
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is the primary function. While no scripts were extracted, the ML classifier and the nature of the URLs indicate malicious intent, likely to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smartcrm.cloud/upload/files/xanozakibajad.pdf In PDF document text
    • http://huzatfokozo.hu/editor_up/tatubofekiguvere.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/44122920936.pdfIn PDF document text
    • https://megashina24.ru/files/files/62975860741.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/50684939050.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/poxolijejakolebes.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/44788730496.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/34789320662.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/30999344653.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/keterurunot.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/35527550309.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/96982391742.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ab5def80ee0a933c91235b44dbd0c1c5/87495466052.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/15932953377.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/24565092523.pdfIn PDF document text
    • http://geasit.it/userfiles/files/ketowuvamiwe.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/83435763376.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109061602396692.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161392d29b923c---wiwalinojotid.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/bepukajaxomuwixowe.pdfIn PDF document text
    • https://pmms-online.com/assets/file/lurujifukilunotuvexaz.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/wivuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+the+ray+gun+cold+warPDF 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_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 10680 bytes
SHA-256: e4c3d5d7bf044f06ef524909f1281ee612984f7890ad3d4f9d73f436d103ab79
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 18056 bytes
SHA-256: c9e7daeb0f8d83a036b353e1a43c9f039f2240f76fd920bcb2d4fc1b8bc2e6c4

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