Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb9996bf92390c8…

MALICIOUS

PDF

77.7 KB Created: 2021-09-11 23:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9f96fe2b0d6e473556b89f0b1b870a1 SHA-1: db1c091bfaf195eb115f39ff6b1762530d8101bb SHA-256: 1cb9996bf92390c8751421258cd0276ff2d8bc937c8695fad7a936b4602a57d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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=world+map+wallpaper+for+android PDF link annotation
    • https://nazrabilisim.com/calisma2/files/uploads/95683358892.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/17832173408.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/10487124316.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/59498992555.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/30690885309.pdfIn PDF document text
    • https://masukpt1.com/contents/files/88475326977.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/63086880225.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2dee003a4---58657587217.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/jupasamoxugaxi.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/21294430263.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/70620746224.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/70424860626.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/dipuni.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/lokafisewunorufak.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tujuvakotuzofavip.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/44434419197.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/22666871443.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/78807593523.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/38600301704.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/kedebaribewenesaguf.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/xokalijejenujopere.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/gadagawenibuxotudotin.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8l0ff7mi0cdvkehkbq9gqlb4s3/29391768369.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/46848947553.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/20179769184.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/35654401983.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/68739365150.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_off0000c764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 18764 bytes
SHA-256: 5655f06ceb0ceea856c5fec7b75c48291069f4033953601743c51dfadf05fa14
font_02_sfnt_off00010f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F79 10472 bytes
SHA-256: 55a92d78ce6377394e5e814a7471cf4222997a64cdcbfab42c12166a922a08cc