Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45d9a3c9e992685…

MALICIOUS

PDF

73.3 KB Created: 2021-09-23 17:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4591faa236dee4ac1005114f8870767c SHA-1: 16759d95932873e1560777a41d61c4323363efd1 SHA-256: f45d9a3c9e992685d2737d02f95247bbd4db114c599a3fb6fea32a8347692761
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, further supporting this. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=the+bachelor+australia+season+5+episode+1 PDF link annotation
    • http://fecoil.com/userfiles/file/40483423903.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/14816301968.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/20571592668.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/51188037139.pdfIn PDF document text
    • http://dd-eng.com/files/files/wabagedukapovemegabesula.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/47569537504.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/befalod.pdfIn PDF document text
    • https://brakos.it/file/fexidefej.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/65506091764.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b366a1656---25533007335.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/28366359470.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/jalisopaxomupos.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/temuxov.pdfIn PDF document text
    • http://buddhavihara.net/userfiles/file/pikomesulup.pdfIn PDF document text
    • http://mebco.ru/images/file/vevog.pdfIn PDF document text
    • http://attlas.center/userfiles/file/satarupizojozuzafar.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373c1dcc1a8---kovug.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/widirikemiwozebamideles.pdfIn PDF document text
    • http://cwesp.biz/upload/file/99514859319.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/dekunukanaretafevefi.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/55615852468.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/1672014269.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/duzimubizuravukex.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/52221824888.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/51996200348.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_off0000b9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C6 16920 bytes
SHA-256: 100daaf74dc9ee40706572971fac70066a359711102b5fc6739effdc416eaf43
font_01_sfnt_off0000e5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 11000 bytes
SHA-256: af27cd39b58f546e92f413493e97871757a201604cc397183a9e367f34ec651a
font_02_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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