Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8a008428b08ef4…

MALICIOUS

PDF

86.4 KB Created: 2021-09-16 16:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb705d8c0085f3d5ecf4e855c6ee2a5c SHA-1: 1acf52a8330723b43234ca6803450387c018c14d SHA-256: ae8a008428b08ef44286037da1fae51ad81a8597655baa271e733142df9478eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=principles+of+marketing+arab+world+edition+pdf+free PDF link annotation
    • http://fipjp.com/userfiles/file/kivulogodoluxepetosulu.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/gufaw.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/pubuputigepujer.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/vifizisuduno.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/54697897798.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/zovevewosetuxumuloju.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xejaxudosazofamenuvefokuz.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/tujemasuwevopubo.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/72038161032.pdfIn PDF document text
    • http://balone.net/_upload/file///16516742986.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/kaduzefijupib.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/suxub.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/95833366588.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/zobuw.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/sesitabij.pdfIn PDF document text
    • http://peoplefoster.com/pliki/65310840517.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/45584657065.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/famukewipudiveziguwavog.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0e35eb47---91297561094.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/bigikaxonejusamir.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/91248421521.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/nuxejok.pdfIn PDF document text
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/wibaputubexuxivaje.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_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 18848 bytes
SHA-256: 97c785064e35402ff936fd889b28ed4e86fd71ed761087160e0faa00fde4a25b
font_01_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AE 11280 bytes
SHA-256: 72f74f853f56efc2d594e2a856ad4f7998f31b66dff0cc3c98b6a546e751da04