Malicious PDF — malware analysis report

Static analysis result for SHA-256 5359df91ea1cda01…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 08:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9490bb2ae7cae722ae91f5177f1ffdba SHA-1: e99b888364c59a54186bb3d536251bfa5aebe5fa SHA-256: 5359df91ea1cda018a7ecf7da7cbf9722b191161959d0bac44fa0bdde2510190
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to potentially harmful websites. The PDF's structure and the presence of embedded JavaScript suggest it's designed to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://crewmak.ru/uplcv?utm_term=practice+makes+perfect+advanced+english+reading+and+comprehension+pdf PDF link annotation
    • https://telliogluhukuk.com/userfiles/file/6262498628.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/ragigumoxepim.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/nitegifirurix.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/zolopuwugozuki.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/3786930454.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/rinozulirarod.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/motebin.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/76012213906.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/dizevodunelepi.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/26323972448.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/1975316668.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/dofifumare.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/togofoguvowovokojofu.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/39525280209.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/77559470762.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/20570608128.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/gazivunatelaruvebanefewa.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/lonebumerapogixo.pdfIn PDF document text
    • https://asiapharma.la/files/files/vubizijagapim.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/67357479305.pdfIn PDF document text
    • http://gojjang.com/uploads/files/jumono.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/61441047447.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/nedafasodunikuta.pdfIn PDF document text
    • http://mgrima.com/files/file/16596683012.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a1006c438c0593ad8a9eb0c10e62f7a7/92628354289.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_off0000ce48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE48 11224 bytes
SHA-256: 9c265f870f549bc3119f2f5968b90c07595841168b5415b28a76707f6eef85d0
font_01_sfnt_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 18688 bytes
SHA-256: 32d44d8adc4790c535ac8c5f90c52d9d9931c68c02a236ed0e528bf75b7c5398
font_02_sfnt_off0001193f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1