Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab038e893246d5e2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 03:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cccd9e5f0b39c017e56c98bc1c0aeb46 SHA-1: 27b36165f107e919c2cff9b16ce0c83867939957 SHA-256: ab038e893246d5e2e5d02c98ee90f65f410dced8fe4c80a30f31eb2f2f31ac4f
66 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains numerous external URLs, with one specifically pointing to a potential download lure related to 'gfx tool for pubg mobile apk download'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, suggesting its primary purpose is to redirect users to potentially harmful content or phishing sites.

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://nomylo.ru/uplcv?utm_term=gfx+tool+for+pubg+mobile+apk+download PDF link annotation
    • http://sweepinstyle.com/userfiles/file/64172912958.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/64557703508.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/96099415073.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/kewezoz.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/86421169128.pdfIn PDF document text
    • https://0900107678.com/upload/file/desunoj.pdfIn PDF document text
    • http://elitacasa.it/images/file/pukavifot.pdfIn PDF document text
    • http://castel.lu/userfiles/files/98155918821.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/13791021206.pdfIn PDF document text
    • http://evola.it/userfiles/files/donin.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161426022275f8---96780669663.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/guponexefodure.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/39133290850.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/gofuru.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/powesoxosozozugetoxinapuv.pdfIn PDF document text
    • http://vo23.ru/upload/file/76310735524.pdfIn PDF document text
    • https://negaratoto.com/contents/files/87834793296.pdfIn PDF document text
    • http://domainecomps.com/documents/files/81083635212.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/sisamaweno.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/pabig.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/loxomegavabogux.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/22932345097.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/68654626898.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/67592660444.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_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 11232 bytes
SHA-256: cc25b4530b70dcc568a5a08c508fa3b8e09e2f73de68aec853c1390c097835b1
font_01_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 19296 bytes
SHA-256: 72e65854a52ff7d78a01bc85d247136c00b8b213d63be35145a9445f45f8eb3a
font_02_sfnt_off0001267c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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