Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb733ba7bc6cbeb6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-24 18:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8283e49b25659f442a18481eedf95da5 SHA-1: eee61fea612977ee553796327f3969d8cd249836 SHA-256: eb733ba7bc6cbeb6e323c6de7d2b1e39c0584b80dd0c32b81c30d283440ccf66
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high-risk heuristic firing for a random URL link, indicating malicious intent. The ML classifier and ClamAV also flagged this file as malicious. The presence of multiple links to potentially disposable domains suggests a link farm designed to host and distribute further malicious content, likely a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://www.pactforfamilies.org/ckfinder/userfiles/files/17583008619.pdf In PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613942451de13---63459800592.pdfIn PDF document text
    • https://kawanmto.com/contents/files/91579705074.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/kipunovaxe.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/vakojo.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/92206506254.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/54641667776.pdfIn PDF document text
    • http://innotack.com/userfiles/file/xodozagex.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/nozutabofukoviku.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/94590285725.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/57105013249.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/5343733987.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/xisebiboza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f0f4eb5f8---zizegebabajavewitu.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/57752740250.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/zaxiv.pdfIn PDF document text
    • https://isleo.com/i_photos/file/70168490676.pdfIn PDF document text
    • https://123natura.com/stockages/files/88712245059.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/18195368500.pdfIn PDF document text
    • http://it-hair.com/userfiles/73327664541.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/14176573344.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/62274374310.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210905111503.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/lonuzosodizemis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+cast+iphone+screen+to+android+tvPDF 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_off0000b95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95D 18068 bytes
SHA-256: feab69d8092e39d328b6cdaf9ccf44b2091b85ce561e341e58e9241ec546bc72
font_01_sfnt_off0000e836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 10708 bytes
SHA-256: 68d1716153aa42ff94a10134c05c6147bc41ad30d4cdd4eb3f55778a894be4cf