Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43fdc6e146bff2f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-10 18:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42ba02177aed229ddc38007fc03c41c6 SHA-1: 6253c8ba5310e0439fbd1e5149c8f61d65388033 SHA-256: d43fdc6e146bff2f5061d25ed34a47341e1f4d116f69e2e07d09727f12485d84
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://moriefrusca.com/userfiles/files/zizanepewawepo.pdf In PDF document text
    • http://group-anons.ru/userfiles/files/47155146380.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/57118336761.pdfIn PDF document text
    • http://chayka-svg.ru/files/nupadazurepo.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/38795330840.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/31435172416.pdfIn PDF document text
    • https://oferta.lt/i/File/5855671368.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/72384436913.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/felafapivozodejobobid.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/91774869019.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/43374133869.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/josezezivufaxudadeg.pdfIn PDF document text
    • http://dsfly.com/uploads/files/76313422219.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/93684019268.pdfIn PDF document text
    • http://jawarakreasi.com/file/katebogopediwokutaroxekes.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/fafizogedelisoninalum.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/zopixetatajexupufififori.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/59222884499.pdfIn PDF document text
    • http://medrea.ru/upload/files/25875600817.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/marejegopili.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/kiduwurunosutuko.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7938768c1---valagewarowemi.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/57975624887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mobile+data+backup+to+pcPDF 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_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 17220 bytes
SHA-256: 422447559975122b1d637210654389fd42666c462eb436f4c9595b719d769377
font_01_sfnt_off00011a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13237 10460 bytes
SHA-256: 2e6367a969df9e7498f5eb5a7ac3275327835de69279ffe889af89eef5199fef

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