Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf5b883183431c4…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 23:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d8260ae2da4b907e5eb3d5fd71f8090 SHA-1: 363f2107555e1974fae4bd872f7a2b50b9590aca SHA-256: fbf5b883183431c4429851ce1ac721b684c1c3b4de793c8b0e1369989ec9aa0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is used to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://apsons.eu/files/file/94973020000.pdf In PDF document text
    • http://iwilldoit.ru/uploads/files/files/51297450988.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/pameja.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/63545302442.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/27845458104.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/dobivejot.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/9012057611.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/nenasiraxawubuzilunimatel.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/lebul.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/namigemafowuji.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/34594539482.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/69342961068.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/zulatatanu.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/ratomer.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/98644969201.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/32600657110.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/20003207100.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/53252789174.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/ridebif.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161328a66749e8---23970496870.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/faditorubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=www+oreo+live+tv+apk+downloadPDF 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_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 18148 bytes
SHA-256: b325f4db77fdbb9bcd5998e15a9626e8082ebba9c18d955c8995aee350a34553
font_01_sfnt_off00011234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11234 10456 bytes
SHA-256: d716ac60c477eab9a798233be8f0ace2a9ace1e6e1e4cfc8e537bd6f0837a673
font_02_sfnt_off00012a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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