Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf195aadf10f9209…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 12:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84ed04bcc1a5e53a6291568dde2ea1b9 SHA-1: 18825a94506a22f2424db59d86c8e83f84a9f4ab SHA-256: bf195aadf10f92095b292a0b0fa3a592b11ad80b779790df11c7bfe33dd3d2a4
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a likely phishing or malware distribution attempt. The PDF structure and embedded content suggest it's designed to redirect users to malicious websites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=rupaul+drag+race+season+12+watch PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350cf069901---84442210237.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/42911385569.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613887dcd82b6---31972292690.pdfIn PDF document text
    • http://namngonviet.com/user-/files/54085900570.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090615841_762918547.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/30525127890.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/38551083821.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/getuwa.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/77208095709.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/miremom.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nemapobiragamaxafa.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/vejuwoxar.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109030056296605.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/3350343141.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/fagovamefazad.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/54115809362.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/172605654361347c712c3f4.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/89803737451.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/gemiwarigavavikabefeb.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/dagitunetezofobub.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/76432321396.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/gudazetuvota.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/98518196206.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/nujujogisef.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_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 18312 bytes
SHA-256: 754453279cb3eae994697ea585911844a27d085816db8d86e964aeef2e44ae5a
font_01_sfnt_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 11104 bytes
SHA-256: cb0a24e918822c65d2f9b0d6e0be60d92160e4d145f151b078d108b93aae9436

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