Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1f1f2fc6c9c4a2…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 02:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1f2568a18b9eb2480939eaaf6ad18c4 SHA-1: 8f0d2af176efbc75c01924acecf1b66e7e372465 SHA-256: 6b1f1f2fc6c9c4a283c1fc6d5a6615b96c41284e91def4d6bbfde6f2971e7aa6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=controlar+mi+android+desde+mi+pc+via+usb PDF link annotation
    • http://www.adarshvidhyasankul.org/userfilesfile/32866952422.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/nojuke.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/togidexeverigom.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/77716385053.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/55479319899.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/zubujebami.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/45830865886.pdfIn PDF document text
    • http://sdes.in/uploads/fexadamuxuset.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/38394368699.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/rimafolofu.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///zosizumikesonu.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/7871701445.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/tipasibexeluteferifujelaz.pdfIn PDF document text
    • http://rococosofa.com/files/files/97457294224.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/34372928439.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/30257832252.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/54936422191.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/52432668774.pdfIn PDF document text
    • http://stefani.cz/fck/file/77048203865.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/demanisuge.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/3686064681.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109172109304496.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/89376172735.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_off0000c373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC373 11012 bytes
SHA-256: c502d0ced5ab1503b3cef1fd580320de4a6455de0963a573a7f9b79932fdf019
font_01_sfnt_off0000dcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD2 17744 bytes
SHA-256: 19060dca9cdf420d783bfaaccd18125b3d00db7d7df6a21e38d20679d2ea4e08
font_02_sfnt_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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