Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c910a8b43d2207…

MALICIOUS

PDF

79.1 KB Created: 2021-09-21 04:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f217b02b2978e11771c44483865056f7 SHA-1: a1091734107224654ab0f706189e4ec5c0c582b7 SHA-256: 91c910a8b43d2207ce996485bfb489d2fe2c90b5adefce5095ef0368dfe73972
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dtyxbpzx.com/filespath/files/20210914082701.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/34bf40e509a550ea793f2f0d317f79a9/migafokesiwujizomalufik.pdfIn PDF document text
    • http://vipdiler.ru/files/file/xemotowewesitegituk.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/dibasowitedodojofub.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc306d83a---vefedemamopug.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/67740693892.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/69311460227.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/59874403678.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/xexix.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/wodefojesikovat.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/2224891985.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/64177631103.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/gukiwojovosakiwa.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/79022426979.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/22351796576.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/dovutebuwubumomef.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/lefujugazizapet.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/vizag.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/51102098939.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/11226185064.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/75636566978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=808+drum+kit+free+downloadPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/vixujum.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_off0000cf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 10860 bytes
SHA-256: a682c9c3e927b8d70d508224cd991f30df722eecd9454cf151a81d2ac7e94840
font_02_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 17908 bytes
SHA-256: bc21a3f87ca688b1d0dc21f1b7810e20aec634119985ec090d7395c9693eaaf6

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