Malicious PDF — malware analysis report

Static analysis result for SHA-256 b405d68fb7686bb4…

MALICIOUS

PDF

78.2 KB Created: 2021-09-23 12:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40f9a49e047f60668d6a589f3ce3614f SHA-1: e57f284c4912a3673c5bceebee0af53b7823c242 SHA-256: b405d68fb7686bb4a43c40f74c332c8991e226a4e0ad357b1255e28342963028
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs suggests the PDF is designed to redirect users to potentially harmful websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://unleadedcoffee.cz/soubory/kisoka.pdf In PDF document text
    • https://servicepapik.ro/files/45155433903.pdfIn PDF document text
    • http://normel.org/files/upload/file/60779361343.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/69651b93148a211dbbeebdc5fe1b4d04/nevagukagi.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/bakelerewinoludizi.pdfIn PDF document text
    • http://blueyee.com/upload/file/191505431608.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/nirorelif.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/90315445152.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/kuxisivefovosu.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/nivago.pdfIn PDF document text
    • http://lg-palette.com/upload/files/xinupomawogatu.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/lurone.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/kogikujatosa.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/zoparapofigirugu.pdfIn PDF document text
    • http://watch62.ru/files/files/51083498437.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/43426353154.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/wasididinuder.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/63230611967.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/vajozewurivelabe.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/kepedofezovik.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/2327520405.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/wupusitugiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=lord+krishna+themes+for+androidPDF 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_off0000c5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B2 10624 bytes
SHA-256: b3e617928868ff5095f0fc2fe9a11ebaaec5bdf3203e63576585ed22372f94c4
font_01_sfnt_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 20064 bytes
SHA-256: bfec98dd2cc1bb7210b8f90c6d189d4a9781c44e6dbbcb985123dc51b9f9ed3e

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