Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb676fe0751f7f7d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 23:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 849657b8c4f91d67038a98494db626ae SHA-1: 0290bf409c6b3bbc91ce971ce666c21719c438cc SHA-256: cb676fe0751f7f7d3e7715c954d251466c0b502e7b254423795c44377b32f68a
66 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded URLs, many of which point to domains that appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination of these links. The ML classifier also strongly flagged this PDF as malicious, suggesting it is designed to redirect users to potentially harmful content or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://antropolog.ru/userfiles/file/bafuw.pdf In PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/89956131190.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/mitumisemanarud.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/xefamen.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/47430785957.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210912150307.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/gizoxatezulokadewe.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/33156484576.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/fokuf.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/bodowatoka.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/27841485769.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/64901933163.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/34530685103.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/62661843658.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/babunukafilurovez.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/61366882930.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16141385c7e157---nivazamodunojo.pdfIn PDF document text
    • http://okvin.org/userfiles/file/46608824138.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/namito.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/tizisotizal.pdfIn PDF document text
    • http://prota.ru/upload/files/72983903933.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/kepezopidagipuxexo.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/40251609038.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/wikalulinovubozekufanoze.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/18481173530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pubg+lite+bc+hack+2021PDF 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_off0000d151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 17144 bytes
SHA-256: f6e714d1b48ae2306d6a5f64a25cf84270944ed9922f34ed73c1b5e646866b90
font_02_sfnt_off000115ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 10644 bytes
SHA-256: 3c3afa3ea6caec75e9e1fc049eee624fbd4248ef263df4a6c06253913137916f