Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee84d82cc05ba64…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 15:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 216002e85ef52f4f01170f897a455643 SHA-1: cc4d4b79377fa787ea2b24ef9e86712f7143fd77 SHA-256: aee84d82cc05ba64a777ab25e0bbb506b9da373df2842f16285168fc192658c0
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=gonorrhea+is+it+contagious PDF link annotation
    • https://manejatuvida.com/images/file/tesogefedokobepi.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/15839603239.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/zabademuri.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/70658341886.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/95429908047.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/f869353a639f0fb1f9c6f72a3d884638/15377085087.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/noxuji.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/rotaxawutivorafewipug.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/wiguretaxulupuzixawatanu.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/79949927165.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/16425178466.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/85651936585.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/95821451084.pdfIn PDF document text
    • http://kco.su/userfiles/file/rutekifomiw.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/69131451077.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/xipululewaxavobexokuloji.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210930192704.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/fojisego.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/32allr5iqpc85n88b2o7o525v6/73838147570.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kigaza.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021919233441725.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/wanutijulelopofexejexi.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/3817471250.pdfIn PDF document text
    • https://shunnasato.com/37522884534.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_off0000b475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB475 16824 bytes
SHA-256: a6f5203d195dffbbe10d4ec6ad7137b772bc616e56e520f5fb8ad412642f9c1a
font_01_sfnt_off0000df0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 10600 bytes
SHA-256: daff62d25a6be38b354f1a0e39c7ff48dd5475877934bee0222a2c027e3d2514

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