Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d038aa1e17720de…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 17:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b3e5b84f1a174cf4a430bfcd68a8ada SHA-1: c7e4aeefb02496ab328300bd0a2e6c031fc63f84 SHA-256: 7d038aa1e17720ded4ac59ae8713bd86eb5ab12324ae49c6d29c169987116bed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leeclinic.kr/userData/board/file/45271049973.pdf In PDF document text
    • http://concilianavarra.com/userfiles/files/42078367245.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/67699323351.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/69598906787.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/33779806135.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/58493311158.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/xozijirumikebawofebap.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210909075506.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/tosuvamisekisurebanuxadi.pdfIn PDF document text
    • http://domuran.pl/files/file/193520225.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/50424393054.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16142fac310556---nutirologigodibegules.pdfIn PDF document text
    • http://expresskaliski.info/file/zipaji.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/80081115888.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hhikpf3uvsnu80pmni6mit54lb/59752376240.pdfIn PDF document text
    • http://floramarble.com/uploads/22428339807.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/68645078487.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/fegimidanijupo.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/51599913584.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/raboviviloteposekomevu.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/rupijo.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/pifekukakutozinatawemod.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bogomuwivitulegu.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/fagenisagawuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=flutter+in+iosPDF 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_off0000c492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC492 10016 bytes
SHA-256: 0be15ca934034d99a57f832de1d260694c45376cf54b75f8cbe4b5e3aadfe152
font_01_sfnt_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 18300 bytes
SHA-256: 59ff73b3a01bc6373552992dcc4348c3775bb9e3ff7a98b8e087626cccf22a48
font_02_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1