Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b7fe4dcd13524b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 01:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4050c84d2d6ef11437949a772d1df049 SHA-1: 36a7780a107e014898c0781ea6876ce6e093c4d1 SHA-256: 27b7fe4dcd13524b94f206a7a6640b38e100e70dada6684b9d710e77bfc0ecde
74 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=iptv+smarters+firestick+2021 PDF link annotation
    • http://pfmconsulting.org/survey/userfiles/files/32539277204.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/19150074297.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/30501873329.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/31282037900.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/70621526931.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/sadaremanamiwowikeb.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/pimexekodi.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/40092910119.pdfIn PDF document text
    • http://onlinevay.com/upload/files/27308431093.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/15309731404.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/rabarovevosakateze.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/98837846090.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/jefutufebotakawurexuxu.pdfIn PDF document text
    • http://progetec.org/userfiles/files/40180055590.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/28351435008.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/43375188432.pdfIn PDF document text
    • http://hmed.vn/upload/files/40839535852.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/76820115199.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a016929cc---jetalekowebuso.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/75057531659.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/20876916989.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391cf06cfa5---ronuxatusofeli.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_off0000dfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 10776 bytes
SHA-256: 2d42c5b52f427ad689441c71a1ce5abfd838eaf12d89ea4103a0833ff1541bd1
font_01_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D8 17644 bytes
SHA-256: e72a172fbc5588e57f9417374f6a0968ba79eb7fdf25374db265b71466ac204b

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