Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45cccc5e4103b48…

MALICIOUS

PDF

74.1 KB Created: 2021-10-06 20:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 66b487379296d88b2ecffe268f0e17ec SHA-1: d8e346a019dabe5ea8ae280a8d9dd59a3ae14331 SHA-256: e45cccc5e4103b48e7d3dbfde138972683157420f7589a9bc211d78bfc5119e7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains embedded JavaScript that likely redirects the user to external URLs, such as the identified 'pistant.ru' domain. The document also functions as a link farm, hosting numerous PDF files on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://pistant.ru/uplcv?utm_term=index+card+rpg+review PDF link annotation
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16149cfa12fd98---zulodusabaxoluw.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/bokelutokamizupotogupi.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/vimapabag.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/kudofugedabalapen.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/monuzemenibosudave.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/xupuxevopi.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/jolepamafavoz.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/bugokilalijelemip.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/11358725648.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161355b7023a67---1826033165.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/48445594439.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/vogebigibidabimivawo.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/88982931877.pdfIn PDF document text
    • https://somogyplusz.hu/files/14058473437.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17260238218.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/96970567591.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/67965606670.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/pitizugenavo.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/49482103374.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/59264251084.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/47179303772.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/22947105931.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/zizomenodunodawosavutiru.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/61621245875.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_off0000bc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 10460 bytes
SHA-256: b9e4e23e9740732a08c02e96e278920cf7fa086ab59ad4f00314691001240cca
font_02_sfnt_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 18008 bytes
SHA-256: 393f44a1e7969b344445dded2acde0bbdd579324fd81e2ca488ec088e6be4646