Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d14d418c8d26473…

MALICIOUS

PDF

74.2 KB Created: 2021-09-10 04:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 402ecda0e5f2d8bb0fef24e390cdd868 SHA-1: 20ecde28396fe00d04dbf09e17af37368d529235 SHA-256: 1d14d418c8d26473c24b89ba813fb0f252decfea4acd244b7d3f211f514bb240
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, with one specifically identified as a link farm. The presence of these links suggests the document's purpose is to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://boldino-hotel.com/ckfinder/userfiles/files/sazuteves.pdf
    • http://thanhnienxp.com/vietkiendo/upload/file/kujepotakoxitokidufes.pdf
    • http://maraulsan.com/ckfinder/userfiles/files/88502158404.pdf
    • http://zenkatsu.dk/files/84465415857.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f3d34e3ca---30213174155.pdf
    • https://delcinfo.ru/img/files/files/78646477914.pdf
    • http://imobilestore.de/userfiles/file/gexerewi.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/jimepasuvekoxu.pdf
    • http://konberdbio.com/upload/files/3978643772.pdf
    • https://webtechnocrats.com/upload/file/53567885298.pdf
    • http://bjqyms.com/filespath/files/20210904235042.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/v1b12scd7o0agp6ou8uteopsal/sulexepokirefebetut.pdf
    • http://flyingkirin.com/uploadfiles/file/090719282960.pdf
    • http://rockpapersun.com/upload_mce_image/file/geketugexizupodabipoxub.pdf
    • http://stoewebdesign.no/userfiles/file/lepovox.pdf
    • https://norservis.cz/files/files/81504164959.pdf
    • https://makanbanyak.net/contents/files/14588605765.pdf
    • https://o2opr.co/userfiles/files/24636216500.pdf
    • https://infoenergie-loire.org/userfiles/file/vosusarakamexiw.pdf
    • https://songod.vn/uploads/image/files/58342164618.pdf
    • http://babijie.com/upload_fck/file/2021-9-9/20210909055556625052.pdf
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/sapoloki.pdf
    • http://riccaassociati.eu/userfiles/files/72741181519.pdf
    • http://annabarons.lv/files/files/kakurenuz.pdf
    • http://cartopack.be/Images/file/kefabubuv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=vampire+academy+untold+stories+pdf
    • 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_off0000bc17.bin
d52600fd30f1880b683642683729492cef6f41bb74ce902fbdb1d1d60a24dc34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC17 17388 bytes
font_01_sfnt_off0000e908.bin
459fcd963bed98a0cfa192cb1c60197fab528de1f2bb4986d27d1f457cbc704a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 10964 bytes
font_02_sfnt_off0001027e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 16792 bytes

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