Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c884811df8bfe1…

MALICIOUS

PDF

88.3 KB Created: 2021-10-05 14:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 36d91f51625c955cecc236a598c67145 SHA-1: 291a3f8f288fcf710b874b1c0b7c50cb32039b0e SHA-256: a7c884811df8bfe14b6df58708db9b1bf9efe5a38de0249df321a9f8ce42110c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ctm.it/userfiles/file/pumafomojatizevowaz.pdf In PDF document text
    • http://styropapex.pl/userfiles/file/rawijaxo.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/velem.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/45035469040.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/73432657266.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/vavajekevalakasedud.pdfIn PDF document text
    • http://sciattella.net/images/file/65780799391.pdfIn PDF document text
    • https://ibextrail.com/editor-images/jesuwez.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/lizinuvugumulonupapibud.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/dokamuxafefiguxutebato.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/94877864787.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/30233506028.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/937656296.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/93737361009.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/nurubizakitezi.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/28923478980.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3723421e651e4e024b8647d508afb204/faduw.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/fokomupexuzu.pdfIn PDF document text
    • http://polkovnik.su/upload/file/pokemisusovapizovari.pdfIn PDF document text
    • http://namngonviet.com/user-/files/28732391460.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/wawufenivitajujanedaze.pdfIn PDF document text
    • http://adriennemason.com/assets/files/berufunaxabusojan.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/84686372462.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/55239140005.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/fodubipelawug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=information+and+communication+technology+skills+class+9PDF 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_off0000ed60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 19416 bytes
SHA-256: 43558051b844cbe6900d1b72fd547171f8a4afcbc38b3bd373f0de658f5f609d
font_01_sfnt_off00012079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13890 11348 bytes
SHA-256: 80c5a2ad91eb5365ac660b415d8fafebe557d0996e1cabe61cb486183c4dee30