Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fea7b7275e142b…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 20:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 130167af155e4db313c453efb73eb105 SHA-1: c360588caff81709193eb03517742bf3d7228008 SHA-256: 84fea7b7275e142bc389c3cf398afeb1d85dd100bb3f586a668f9a87c1dd8889
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs for link manipulation. While no scripts were explicitly extracted, the presence of many external URIs suggests the document's primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=picture+quotes+and+creator+mod+apk PDF link annotation
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb742689bf---88713728215.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/nopinilodafizomejavux.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/92107160926.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/kudanaludumetegulamu.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/remenabovefudawixuzalun.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/tajedigokanovowupowese.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/gixofofakarovewepamamufa.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/kojadopizurobuxuroxo.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/gulomadepemagigiwaxinojow.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/kuwewoj.pdfIn PDF document text
    • https://bachson.net/upload/file/50492202196.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/bepodidisexepuraleneg.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/23422980363.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/xojojufipafenusuwerufegib.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/38365982630.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/wimovurosedapivapadikuv.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/jogobowunomulebagoxog.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1ef76439---kazabesapug.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/jogutodupuziwanewe.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/82003602199.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/bisegufi.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/kipaxakupefugamom.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/panaregowebe.pdfIn PDF document text
    • http://rooptex.com/uploads/88521902537.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/55204570362.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_off0000c712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC712 10968 bytes
SHA-256: 0f578ea6ffbc50bc0e718260b5da29ec59473b879c022bf8c53865c4c85900d8
font_01_sfnt_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 16476 bytes
SHA-256: 75fa93536647d6c3960fc20fff668fcd9499fbd3ae5354ee8a4ae661ac0d82e0
font_02_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1