Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a878e2995ce53d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-09 20:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 7e37291a1dcac13f13835898abf848d8 SHA-1: 613a43d962f79da5b7fcfa6414d8d878ae7eb2e5 SHA-256: 11a878e2995ce53d41cd999228b392f35ae3064d4a92de24cac1a6b5abccb321
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, suggesting a link farm or phishing lure. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://asja.ua/userfiles/file/fazujikurijotinol.pdf In PDF document text
    • http://www.deco-interieure.com/userfiles/file/gafuzakegi.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7af30cccf507acd0852aef88d3eaca11/zuvegefup.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/96775378299.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/zameloviliwitil.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/nuzakakenutawelare.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/52921389065.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nebogegilidutok.pdfIn PDF document text
    • http://edeins.com/userfiles/file/jotigoj.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/waxolajotuxan.pdfIn PDF document text
    • http://denge.aero/upload/files/98533447641.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/6335921621.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/54005737611.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210903_133656.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109012205476273.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/92401771793.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/leliru.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/siziwo.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137aeb8d7a79---95487819389.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/kikigidudikatibejifono.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/86999723439.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/80714517966.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/zemidoniwezojevavakiluxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=film+francais+streamPDF 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_off0000b1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C6 15620 bytes
SHA-256: f7c0cd91722e3bb34244b8e70439d064e00831e5f229e33a0327b70f70c3e055
font_02_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 10356 bytes
SHA-256: 0876c1e0168de1cf933e3de033c82990c0002c4a5726ab5d9ed16933840f3541

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