Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8dc67b63954255…

MALICIOUS

PDF

84.4 KB Created: 2021-10-11 23:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb44f0612e667c241f5eab6212ffaacc SHA-1: 16fed7d8b0dd0879915c92b07a40f8b738bac0fb SHA-256: 4c8dc67b6395425595b721eaff1da42ac2365a63ca3a7080b78d81e7f3cc2f22
66 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. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, likely serving as a lure for users to download further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dolnoslaskialarmsmogowy.pl/imgturysta/files/fumuworelukalekov.pdf In PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/1902341372.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/muje2ph7ro7arjquh0g50enf2s/52146622902.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/91324963863.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/jitewolosuwizuvaxozaxopig.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/xokimivokimadaduwuzefu.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/80876345068.pdfIn PDF document text
    • https://pmo.jot-solutions.com/files/joxitavokunoxi.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/94750843597.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/89378147360.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/79444855162.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/rasivexukozidoborapim.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb2d8e116f---73999394543.pdfIn PDF document text
    • http://signauction.net/userfiles/file/28186034837.pdfIn PDF document text
    • http://orthodoxnews.us/file/gibafo.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/gurejopimo.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/saxometajedorekuzewom.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/98062022564.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/54126825858.pdfIn PDF document text
    • https://akconta.com/uploads/files/85620569252.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/1849537571.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/vuxirikezekoxifufe.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/bopivunusura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/1hHberoKktI/uplcv?utm_term=assassin%27s+creed+iv+trainerPDF 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_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 10280 bytes
SHA-256: ef58cc3454726b079c439bb39cec015a6a678ae9279ab45bfd9ad1fcd47027c8
font_01_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 19240 bytes
SHA-256: bc8260e2b3b4fcb13aee06f805f3ac03a754372bbe2f14e9da1969717431c012
font_02_sfnt_off00012b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1