Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfb41b2599d640b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 15:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee0b859eb68f17cf2bbacd50a2ee9870 SHA-1: 9bd92906fb7ea690ff1ebb86d262db187df27fdb SHA-256: adfb41b2599d640bef50faad148082c833430ab60113036bf57f3528903bef21
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to distribute malicious content or phish users. The embedded JavaScript is likely used to facilitate the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://otpetye.com/images/shared/file/70046635177.pdf In PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/mijenanelalezojanato.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea97ef72f---bexik.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/87076993109.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/98723912717.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/zogudinezofebiduzije.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/41705446205.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/debis.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/ripikizog.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/bowofufimosisezubimutokon.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/42729462277.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/juzozot.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/84030311042.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/81797333265.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/12774879035.pdfIn PDF document text
    • https://polaria.cz/images/file/liwolowiwit.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/92028629689.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/sutoju.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/sapubuvomibokawura.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/48567874954.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/lejag.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/bipitepuzuwadediwolej.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/56357164973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=wibr+plus+downloadPDF 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_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 10472 bytes
SHA-256: d379e9e88dd179da4a7769bbe4438c2154fe78fe05f8312e817097cf0298176a
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 17568 bytes
SHA-256: 028bcad1ef2da07c3c3ed02d218a0da1fd42b58d7516c88c13a6c52e9ac05482
font_02_sfnt_off00012333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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