Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd85f4d403eba746…

MALICIOUS

PDF

73.4 KB Created: 2021-09-25 07:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 82df1be27880ac146c30d25edc452451 SHA-1: 7f2c2b89681239963088e6b2c0c3dc89628bb272 SHA-256: dd85f4d403eba7462ec5102b8a91ddf9e1acb28638df98288e45b826f4540f7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for a large number of links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/uplcv?utm_term=how+to+find+forgotten+pattern+lock PDF link annotation
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e1141d8dd7e0a1d09482aa5281b7d6b/puzojetusakojas.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/62954882699.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6a99d9695e814ac2008391406d56fe0e/90965581344.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/77086717364.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/97027074998.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/81141701428.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/vipukep.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/kimoxevujafusesiwekaxet.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/renugutixogu.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/48909606973.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/ratujodazowinukunaminilo.pdfIn PDF document text
    • https://angkalaris.com/contents/files/60204914344.pdfIn PDF document text
    • https://elemonbg.com/Files/File/61209479255.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/83487837514.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/24974622245.pdfIn PDF document text
    • https://dienmayngalinh.com/img/files/55356411159.pdfIn PDF document text
    • http://getem.eu/files/file/67051652591.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/50221503572.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39347340697.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/21923733346.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/nivevirenebefaxazu.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/jejozobezeposabufose.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/797412555.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/jeretulilinejusipov.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/22357787768.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/5763826019.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/vuvudisutuzepol.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_off0000b907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB907 17780 bytes
SHA-256: 90213fd19606ab8d98489f8f9baa4266142f52448e20700c54de26a896b33032
font_01_sfnt_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 10796 bytes
SHA-256: 957bc9bebc2a35461578f8737e973cadb570a4185216f35d549ddd9808b66457