Malicious PDF — malware analysis report

Static analysis result for SHA-256 c046c57ce314014c…

MALICIOUS

PDF

94.8 KB Created: 2021-09-21 03:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbd46d412f5371489e3d41c494ccdda4 SHA-1: 1fcea819a5836bc6836c1001f105f122fef76a13 SHA-256: c046c57ce314014c025fd3bf9a243de5c8804e7d315febd1781b0fb05f4e46c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable domains, indicating a link farm designed to obscure malicious destinations. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://mya1fc.com/files/ckuploads/files/83861515214.pdf In PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/6381142720.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/gedudavugagipijudij.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16318548936115.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210901220035.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210905021148.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/26047203133.pdfIn PDF document text
    • http://baove24h.info/upload/files/bewowuwo.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/60122314884.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/75991408e59462e85cd371d37e075c2b/rapukogasuze.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/robumefesevolitodo.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210906163740.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/midonosi.pdfIn PDF document text
    • http://gdgom.com/upload/file/210912044708916971ti24g27lh0l7.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451042196e6---juseguxivu.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/31992731650.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/rogidarigeduw.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/vopex.pdfIn PDF document text
    • http://leguido.net/files/sedezedemofoxivuger.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/84419155998.pdfIn PDF document text
    • http://chpcentre.com/files/file/guvesupadodinebus.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/labaxomifevowoz.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/60651057560.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/15498127147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+two+colors+combine+to+make+orangePDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210908/16310630817517.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_off00010e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 10988 bytes
SHA-256: e756a0f47e0f62fc4d536135b09a48716df187f8aa2ca617b403c02bfef3e236
font_01_sfnt_off000127f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F5 17624 bytes
SHA-256: 44b267b6d4b2001fc97ece9add0b05909e3fee77fb655fbbc0be3bda2e464bec
font_02_sfnt_off00015579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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