Malicious PDF — malware analysis report

Static analysis result for SHA-256 83343119f2f0339a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 19:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 708c637acbcc3256406dc867b4686a12 SHA-1: 14cee874097a53c76bcbbd8c99a5bc89a9081e9b SHA-256: 83343119f2f0339a31c540763440c348e05b2b39b3d53125de42e07b9b624edb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains embedded JavaScript and a large number of URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of JavaScript indicates an attempt to execute code, likely to download additional malicious content or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://middletonchambers.com/ckfinder/userfiles/files/67980984614.pdf In PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/lozof.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/59077208560.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/vuwiginilolebuvijoramar.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/96268467161.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/61519411752.pdfIn PDF document text
    • http://freeorden.com/media/file/wodune.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/87246397600.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/78943284083.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/30936949313.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/dubuvumugivivuzovutug.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/nepozikezo.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/79118414498.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/4630607162.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/94226573179.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/dimozezegizom.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ee6d03125---33819228568.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/35657407959.pdfIn PDF document text
    • http://netart.hu/userfiles/file/21103010565.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/60502562768.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109021918141027.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139197fe6d66---gitivabekijixanozidekab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+run+apk+files+on+chromebook+without+developer+modePDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/roregubuduguji.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_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 18896 bytes
SHA-256: 0cac4aeb7b77b0bf90c57d76085c42396e7a0aa1b476f1cf5a2c5341d54778ec
font_02_sfnt_off000124bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 11360 bytes
SHA-256: 69123275b7a586397be7f28f26ccc2267188290b68924934b0f6e58d9a00af96