Malicious PDF — malware analysis report

Static analysis result for SHA-256 438e25ea08cce51f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-26 23:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e11011f5eaeb8063367cd2604878b716 SHA-1: 68526a942c35ba472cffb937c5e2a14c3246fdfe SHA-256: 438e25ea08cce51f04f0b181875d66f843f5dd404e57b035604ca4afd68644c1
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and multiple heuristics identified the PDF as a link farm hosted on disposable domains. The embedded URLs suggest a redirection mechanism, likely to facilitate phishing or download further malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/uplcv?utm_term=geometry+dash+resource+pack PDF link annotation
    • https://maffart-guy.com/userfiles/file/45299451392.pdfIn PDF document text
    • https://cartolmania.it/file/18390948066.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/voxinofoxuwix.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/wunamadisofatilovasu.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/82001449912.pdfIn PDF document text
    • https://qcbusa.barettis.com/userfiles/file/dixelabiwavodugotige.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/82825203679.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/pezidusevuweku.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/55906584652.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/54605253150.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/mexevow.pdfIn PDF document text
    • https://cathita.vn/upload/files/7321708924.pdfIn PDF document text
    • http://dakov.hu/_user/file/lobabukusapipen.pdfIn PDF document text
    • https://everestart.com/images/stories/file/49413080371.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/87142350958.pdfIn PDF document text
    • https://felicityokolo.com/file/boxugamej.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161457869d0dc6---wivis.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/gagis.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210920182515.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_off0000b203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB203 10880 bytes
SHA-256: 662167d920f18d8e4a1ea64596a4b25b9f6b4c6d73aa79e1f5862db557889e14
font_01_sfnt_off0000cb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB47 18324 bytes
SHA-256: 5c37d84d6269071714febcbaf5db9d598e60961773f138fb2d85018ff7fe537e
font_02_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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