Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d50c752665dbbc…

MALICIOUS

PDF

83.9 KB Created: 2021-09-24 06:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72f9b092514473fc163256286736cd0f SHA-1: d6aab12a5a468f1238bac9ba1d9793fa41f9617b SHA-256: d7d50c752665dbbcbb357baabe961a91746619fb11d503c2f10d5b7a7223665c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic analysis identified the PDF as a link farm hosted on disposable domains, with numerous embedded URLs pointing to potentially malicious content. The presence of external URIs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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+can+i+tell+if+my+tablet+has+been+hacked PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161328c47104fd---sofivasapizizusakijipun.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/26269275079.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/xurakidubebitijopiwunugot.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/10479390660.pdfIn PDF document text
    • https://fivetc.net/uploads/files/78917284264.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16133a668934a5---27641361431.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/75315511740.pdfIn PDF document text
    • http://hla.vn/upload/files/neriduwinorefaj.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/80154554129.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/jefanoraxewum.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/56599573771.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5b44f9ac3b11f683e495c458423551f7/85953929737.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/zaberoguvujujeriludelo.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/89300898124.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/56404817775.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/16695671670.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/11348658877.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/vaputu.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/jadowaralosodokose.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/17765437141.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/94133552634.pdfIn PDF document text
    • http://strahyi.ru/images/file/37745782059.pdfIn PDF document text
    • http://hklh.vip/data/attachment/file/20015123176.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_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 11064 bytes
SHA-256: 8b6ab6e36bacbb467474203e6331228d48d80ac2e62d02108225d96c4b5b02bc
font_01_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 17848 bytes
SHA-256: 291b477a5d5aae46c26788817f859b30d2562a25b604e23029cafcf25b34ef1e
font_02_sfnt_off000129a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1