Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea371c8d8078eb6c…

MALICIOUS

PDF

68.9 KB Created: 2021-09-30 15:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 57ca3ff6ca395b4c7e09c146635171b2 SHA-1: c760713f8948c86749b6b49d0a33447c17f5fb56 SHA-256: ea371c8d8078eb6c410ccf3a640d883da2e2fa04e65c24c3c670bbd33657f165
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. ClamAV and ML classifiers strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133b73bde1d0---webitovazotavixexamidike.pdf In PDF document text
    • http://yasaitogo.com/uploads/files/nugikabovif.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/85081740853.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/29707102390.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/14819925370.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/71556213801.pdfIn PDF document text
    • http://orthopediedelft.eu/files/xumedojojakuxivolebamo.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16143641b01631---97650968008.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/67018486255.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/9681729317.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/30989585568.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/wokasikuf.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/mapiberosamejesekudufom.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/nozakokatexotubimiluwumuf.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/sozugunikutilirimuxiwor.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/68684053955.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/galase.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/gajagu.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/19587604851.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/pezukupujim.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/785960092613b412b4951f.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109071127244718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=starting+a+sentence+with+nowPDF 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_off0000b00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00E 14820 bytes
SHA-256: 88d4549b13a38c74d75b58644f7e638f85cbebce27fa9f31e9451f0ee922f92b
font_01_sfnt_off0000d589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 10624 bytes
SHA-256: 4378afd7a53899bae39431ee4bd1251ae02a59fc31d264bdbe6ab941a8e0f880
font_02_sfnt_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1