Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f42b834dbf4078…

MALICIOUS

PDF

69.1 KB Created: 2021-10-02 11:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2f5c3e20d350b73798f6c7c533bc769b SHA-1: 1d8cd3ae35acf3c4954403e839e0c9af584584d9 SHA-256: e4f42b834dbf4078d45dab63f4d47f7d46202224e2aae2586d693bd85d1e114e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the purpose is to host a large number of links on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://ikkosushi.com/uploads/files/xopexebisuzefopogekaje.pdf In PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/90559904704.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/95498692239.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/terekimomateza.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/rurinufetuvikawew.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/kobejivegibikolurenunuj.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/jilazilikukewipivofu.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/fuxowagaju.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16142882f3a73a---98794663376.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/nuvofupanalefofigixuwonel.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/mudekigagawifijilar.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/58335681781.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/zoposadokas.pdfIn PDF document text
    • https://jobtiara.com/files/files/74431073923.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/vepesuzekokug.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://viviapalermo.com/userfiles/files/kinukufodanonuzedopujej.pdfIn PDF document text
    • https://profesa.net/userFilesfile/soputunakev.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/dosujosubugijizamiji.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/libaxozikuli.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/69467894902.pdfIn PDF document text
    • http://rentaruedas.com/files/others/fowezidam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=miss+maudie+quotesPDF 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_off0000b15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15D 10396 bytes
SHA-256: 0de673f7ac730e1e8db89341f88de65b0d0d4a3ab34e53d7c08d92bb59b66dec
font_01_sfnt_off0000c8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B6 15144 bytes
SHA-256: e7503786dabf0cf275c2fcf7ba7f9f6e63dd38d29f3b933d557ac520ee24c802
font_02_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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