Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ae2eb4e778000f…

MALICIOUS

PDF

84.4 KB Created: 2021-09-22 15:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aa7b48a8b8942edf95be1d9b9a119da9 SHA-1: 57463c80fa312fbef35260f1d0dbbd14eead4253 SHA-256: c9ae2eb4e778000fe6ea9e3725c3199184e81af9ec36065d5cdc7e41b22ec1cb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of unknown reputation URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate 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.
  • 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://beming.com/ressource/site-image/files/22268543257.pdf In PDF document text
    • http://mq-water.net/upload/xujimowut.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/dewevorufa.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/kapejilodi.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/dogezebezabokil.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/68396252921.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/julupokaxewep.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/38822438869.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/wejokufakaruwuro.pdfIn PDF document text
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/73117921378.pdfIn PDF document text
    • https://polandpools.com/contents/files/44934696696.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/lametuxazulo.pdfIn PDF document text
    • http://nincity.de/inline/file/kisuseselerodunereweda.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qlfucalqpc0p17vtv7le7p3s6q/wexojijajob.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/muwibopud.pdfIn PDF document text
    • http://grabnerestriche.at/nanepaxuvotuw.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/nonumanetep.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/rovisilalijejeronezuko.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/66467316571.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/pinesomivisezelukup.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/t89jajaa4t8pt23sphs44m19mc/loputomumoza.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/niteberinedag.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/detirizanoxemajo.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210915_F398E92BB6551A98.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210922202134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=game+booster+4x+faster+pro+plus+apk+free+downloadPDF 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_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 11204 bytes
SHA-256: 2c7614c02fbdf7ba3660cc79748ebbfb84fe4f559c2bb2159107a43b0b190bcd
font_01_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001160e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160E 17836 bytes
SHA-256: ab611d074053bf6c87a7c6e1d6642a3b0255b99d0e72c72767921a725edec6d5