Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9d5a1122f0d6eb…

MALICIOUS

PDF

85.8 KB Created: 2021-09-09 00:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 818280ce4776ef2ca9f15ce181ba5386 SHA-1: baa231f9f970ae967ab268c7f3c5faf35bab1669 SHA-256: ce9d5a1122f0d6eb89f88414ece4bcab7b5f82d6c2d573461ffbf735f1c49640
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download a second-stage payload. The presence of JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://irlanc.ru/uplcv?utm_term=mcsm+mod+apk PDF link annotation
    • http://www.sandipmallick.com/fckimages/file/91262158242.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109062032317361.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/sodiwata.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/wibifiporimomusunuxog.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/87736125699.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/27598133233.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/90307693662.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/suwejifidogidikar.pdfIn PDF document text
    • http://temple.mo/userfiles/file/zidisuxaferujej.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/jewagokip.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/50647127368.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/87230380846.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/dogukasikigokunu.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jawimijutigirodijuka.pdfIn PDF document text
    • https://flyags.com/editorResources/file///janonanoboxemepagonezozu.pdfIn PDF document text
    • https://fasleh.net/Files/files/susanewejobafu.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/jirunegosu.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/boberefeferusikotemu.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/razixurolojenuva.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/85019718823.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/vesoketadalifa.pdfIn PDF document text
    • http://savemaxint.com/files/file/15496388211.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_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 10188 bytes
SHA-256: fedaa63059f70f0caa5e0c3e9a4e80fb8068ff3a02fd0bfb6c74df91a9b4dd9c
font_01_sfnt_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 19584 bytes
SHA-256: cbb4814de66635c20c56b0e6c97760b1bf19ddf100a9af8718c34149a7a8630e
font_02_sfnt_off0001325c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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