Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c32d315291cedf…

MALICIOUS

PDF

72.3 KB Created: 2021-09-24 02:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7670f2977c0cf60fd93a1149357a97bf SHA-1: 923c99d4d097720050301e9276a61ccf688262de SHA-256: d7c32d315291cedfdce19de8735b2431b7a09d32ee886e56aef469aa4da50052
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the links. The primary attack pattern is likely to be phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=cookie+clicker+unblocked+hacked PDF link annotation
    • http://ylpqzl.com/ckfinder/userfiles/files/26154755627.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/5842565398.pdfIn PDF document text
    • http://sung1.com/upload/files/95492665497.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/9s2cic5lbvs45kl98am07kh7so/zadukimokajize.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/70689995637.pdfIn PDF document text
    • https://agrando.cz/files/file/nozopepevovoxuzok.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/fipegoxuxejifoxagolovi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a3963cf4f---wokujanubes.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/wiwesopozoguma.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/jenupabukokavajebe.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/safezojovoves.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/welelevusatomafozamosilit.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/26355715579.pdfIn PDF document text
    • https://costarica4d.com/contents/files/24663188408.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/78126936577.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/konugeb.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/dovipujaxutajaxolarusake.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/95136708671.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/77016449467.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/fewujezufoxob.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/fokatebadapa.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/22244466195.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/90147348932.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/menibizekonakaloweju.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_off0000ba8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8C 10564 bytes
SHA-256: 0cca22cc53ccf536d6ad09ba545b35562867bab6bbf59e9ff839cefbbefcd56c
font_01_sfnt_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 16072 bytes
SHA-256: 3ddc5832d33d33f6677243427d5569a665110797f9e3d38b8f27d633247f3aa7
font_02_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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