Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4d31991ca29cee…

MALICIOUS

PDF

76.1 KB Created: 2021-09-28 13:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4fc6d396fb049135fcc68a44a762cd03 SHA-1: 7e64994993873bf7deb153708431b3ae78cce6c1 SHA-256: 5c4d31991ca29cee82720e5e0573994f4a870e42d01306343b0e3b047f1fe2e8
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, 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, likely for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://fanghsin.com/uploads/files/202109232300526059.pdf In PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/63096752117.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/41222492746.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/15524906899.pdfIn PDF document text
    • http://ruihuitax.com/files/file/90069946403.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/gobubedaletifimuzewe.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/54191572034.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/kixafugen.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b61a8d119072a11e791dec2728fd671d/rarudunizo.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/lubatuwekekafuraleve.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/51404391849.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/73772392387.pdfIn PDF document text
    • http://becucci.it/userfiles/files/54825515590.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/mokalikurirun.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/93525569938.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/48067837509.pdfIn PDF document text
    • http://wych123.com/upload/files/38592783835.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/fowofuxuroro.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/27278136443.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/xojupofegalesis.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/didarixixor.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/3059675276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=shahezad+kazi+bandharan+book+2020+pdfPDF 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_off0000be37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 20012 bytes
SHA-256: c35fce49dfb8e59c73faa85df06a47d3e1c580a3bf3653b2b94c242569dbe5f6
font_02_sfnt_off000109d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 10892 bytes
SHA-256: 1d938a702c54b9d62c8687bde87d8faa776753cf59058064ee35d5b6075c16cd

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