Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64125f7e387094e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 00:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 655652d51a8761aaaab59261eb6a2720 SHA-1: ad1ffd170b51b44365f90c5a02cc2b7161b90fc6 SHA-256: a64125f7e387094ec4f5bdd85aa5c4006c267ec1a68bf7e71ad7fc9c8cb0775b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The primary URL, 'https://drafthe.ru/uplcv?utm_term=roblox+codes+for+robux', suggests a lure related to popular online games to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=roblox+codes+for+robux PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/esjs1d3mqel8ro90qhhi62jsc2/91310813606.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/jakux.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/58477859761.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/dc6437373d618ae03953d6504c544da8/73428359236.pdfIn PDF document text
    • https://nada70.org/userfiles/file/pumibipufepuf.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/99257656541.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/7609944172.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/morevukuma.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/6732455276.pdfIn PDF document text
    • https://red-adlay.com/upload/files/pisevezeranojisik.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/diwigi.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/86536334220.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/69503175243.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/25005528459.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/salefof.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/pumudasubizetujowa.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/90461398901.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/bijukedakixujomefaluwu.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/fiwarunafefalux.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/zijofofenaviribotumibeb.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/gakedul.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/wakuw.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210912025343.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/92030313059.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_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 17744 bytes
SHA-256: cf6f44713812619cd91a996797fe98a5ef383c8b258d8f98606b400ccb3daf83
font_02_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 10400 bytes
SHA-256: 2a5aff33cc74bac948b9b405529926150707719bbacf8fc0627fe54ed4b35b6f