Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58ca602aea196ba…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 03:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4880f8f6a1c5ba922b6be03780824b2a SHA-1: 495cfa039f634859c6c6ebd5f78d4ffc12c7acfe SHA-256: d58ca602aea196ba389569d0ce81dff1b5e43cba29634ee45a98120454d4761e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/82c5c818076b9a5304097e697ea53b7d/jubujefumanabesigekigo.pdf
    • https://kubermatkaplay.com/ckfinder/userfiles/files/41174701191.pdf
    • http://wxhsbl.com/ckfinder/userfiles/files/20210909_120756.pdf
    • http://kennycojewelry.com/userfiles/files/202109/1630899440.pdf
    • https://metrosecuritynepal.com/assets/userfiles/files/narupotuvama.pdf
    • http://kokocurry.gm/userfiles/file/96981664515.pdf
    • https://alpinashop.rudy-ra.com/files/sazafusilanufenajune.pdf
    • https://taxforce.nl/userfiles/files/tebizesagek.pdf
    • http://eqletstalk.com/uploads/files/202109072258243143.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161368205e8ccc---rapozubedonodatebovozumup.pdf
    • http://gorisum.net/fckeditor/upload_file/file/pivikabirudixitanapumu.pdf
    • http://hani-bee.com/userfiles/files/dawujibajenemelivobo.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/11458399659.pdf
    • https://noble-program.site/js/ckfinder/userfiles/files/79747404292.pdf
    • https://okinawa4d.com/contents/files/62642713153.pdf
    • http://renknh.com/ckupload/files/28400493749.pdf
    • http://fourfoods.com/images/files/73904096000.pdf
    • http://only-svet.ru/upload/files/70412806712.pdf
    • https://umutisi.com/umut/upload/files/paxadezavixijunapetepa.pdf
    • http://zespolbahamas.pl/zdjecia/file/mujodidaxeledixusuzutome.pdf
    • https://henseltech.cz/userfiles/file/zomibibok.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fishing+goal+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce63.bin
dfb0b33555603080c6f95bcd1885a8cfabd1156b50e92bb8283defaab01f55f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE63 10576 bytes
font_01_sfnt_off0000e5fe.bin
434daf304eedf60001394a9f92bc84059c2ce8f288dfc24e4938bceb263a837c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 20212 bytes
font_02_sfnt_off00011af5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 16792 bytes

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