Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44aa0fc69849d7e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 06:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 88482c7ae29c9e9c35f935bcb3aa0f10 SHA-1: 1ebdfb48fb19ea5595a88b6dc28b8b089737b568 SHA-256: d44aa0fc69849d7e005c23e6021d8278559ffef65e2cf50c2c1c01b2aafb8005
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 potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to further malicious content. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://gdfsztal.com/uploadfile/files/90633948981.pdf In PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/99709429878.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/xejemozudob.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/pejunaxez.pdfIn PDF document text
    • http://expresskaliski.info/file/kesodin.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/wasidutorumamedi.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/nefonegidemixaralumod.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/xunorezubupakowozisaveb.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/14532314550.pdfIn PDF document text
    • https://questyme.com/userfiles/file/didoruzirerofisiketi.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/juvugemijowebuda.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/66944089851.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131894faa13e---zuvojemexesexubupatereb.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/33433094136.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/81587458170.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/dofupidepapojefomisulurun.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/49769126136.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/16726461545.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/zovof.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/lexopilago.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/5042859368.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/19674490530.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/26618262955.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/47900910515.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/tapizikosikupa.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/55682617381.pdfIn PDF document text
    • https://pr-dienst.ch/file/bojazedividibetago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ac+market+for+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_off0000d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 10304 bytes
SHA-256: c548ef541487414adeae20b7f57c8acfdd5e1ad5b4348e2808de7d965c7ad197
font_02_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 16740 bytes
SHA-256: 147c49adf54c6cb3d95ee2442057d122a5349dea6bb8fc963b471d4d1db39784