Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5d28fa12637e62…

MALICIOUS

PDF

71.2 KB Created: 2021-10-01 10:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2895c912800d60b0bcc6c7420ee11833 SHA-1: e582cf52bc82bca31dde5807b7f74cee32ccae4c SHA-256: df5d28fa12637e62fc578d1ea89c5b63395c493f19a9146ca352de7ba07de732
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://55pluscommunityspecialist.com/userfiles/files/rufunamadizokitimi.pdf In PDF document text
    • http://phukhoabacninh.com/images/files/9414777497.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/buwafinopasepekupora.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/fujibopeledejadupa.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/79051829058.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/10519392494.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/zafivenulevomogeka.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/xaxafowuxufezuvunovix.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/kugetimerazoledubos.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/xukopuvezubo.pdfIn PDF document text
    • http://royalgroup.at/tmp/jisijufabirowebexivavil.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16148eb86b94dc---gedafetopukapaxidisubiwov.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/galuv.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e2ac7f4f5d341bf73d41f0ce5ef2d5ce/fegeleberigud.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/26197829434.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/14182892351.pdfIn PDF document text
    • https://cardolf.ro/files/repuv.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/62286362664.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/55108031409.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/tunizodomuz.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/madinidokekowoka.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/sajurofuzitanatag.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/95446082586.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/54256121036.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/88250111000.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/66641117349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pie+icon+packPDF 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_off0000b52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52A 16920 bytes
SHA-256: 12f2d4c108287df4d27d49ac460f061439e4a9c611c9b0ee636149c589e4ced1
font_01_sfnt_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 10048 bytes
SHA-256: e30faf21472487866eaa2008fce4bed1f6bc0a4b5086d9e6fc267c9aff8ac52b