Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79f6468285891fd…

MALICIOUS

PDF

75.0 KB Created: 2021-09-23 09:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8070986557b910a8a7e8dfa452764526 SHA-1: e963e278651524edafa0ba162791c28d8ba5ec40 SHA-256: d79f6468285891fd1f8d8b3de14fe74862cea66258aaa0bc89c832781ac2e904
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The presence of numerous external URIs, many pointing to disposable domains and structured as a link farm, strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://facilitymanagementassociates.com/survey/userfiles/files/80006774465.pdf In PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/kejutafugupi.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/79270734707.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/44880880841.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/jutelovulosilabimawanekut.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/68544985159.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/tagijazutajomudo.pdfIn PDF document text
    • https://samowar.me/userfiles/files/56858813075.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/87361843447.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/busidapizupojivogovida.pdfIn PDF document text
    • http://rapet.hu/files/rivuvomebotixakox.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/51789116482.pdfIn PDF document text
    • http://actinq.nl/upload/file/risavo.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/gigebebajepe.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403e601a91b---80443873053.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/48898939078.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/19149819183.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/zudafuramutebufupew.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/vovigebuvorafasiwoxipa.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/vaxow.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/warevowepetisuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+version+1.16+0.66+downloadPDF link annotation
    • 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_off0000c1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E6 11020 bytes
SHA-256: 0e2577c65d90a4ad3b3c9ea27712ab98fc2c9c37dcdba439dd3867024234895a
font_01_sfnt_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 16668 bytes
SHA-256: 0d9f600c4fbe76510638f71123f0525358888e85585406ac9c983098b185b07c

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