Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f4b4247fb1132b…

MALICIOUS

PDF

75.2 KB Created: 2021-09-11 02:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff5a24b3f73401faf6bbf657cb348b3f SHA-1: 93252604b23b51b8ba600698f737c54fc6d6e147 SHA-256: 20f4b4247fb1132baee7e31d4cb396ec6e2adbb8644fff90a53b360397a77000
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a large number of embedded URLs pointing to various domains, many of which are likely disposable, and is flagged as a link farm. The presence of external URIs and the overall structure suggest a phishing attempt or a redirector to malicious content.

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://creationart.hu/files/file/22424604601.pdf
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/96948932980.pdf
    • http://poorclarescork.ie/images/rawubawumugomozagubuzago.pdf
    • http://studiotecnicoligioni.com/userfiles/files/lonigovafejagopipotufekil.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/71947003002.pdf
    • https://niboparis.com/upload/fckeditor/file/1630948974_1.pdf
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/2746065483.pdf
    • http://labuchedeberce.fr/userfiles/file/69382065274.pdf
    • http://kondicionery-pushkino.ru/upload_picture/file/susemeluro.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/89497518129.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4728fc9d337ab522cb7fdc5eedd8dfcc/12551174227.pdf
    • https://agriplan-rs.com/dados/ckfinder/files/74408098713.pdf
    • https://alsultantrading.ae/userfiles/files/25726815232.pdf
    • http://shoreluxurylimos.com/userfiles/files/61252610074.pdf
    • http://haozuowenwang.com/imagefiles/file/12621952445.pdf
    • https://artedeeducar.com.br/ckfinder/userfiles/files/jepim.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/36517437234.pdf
    • https://sagarexpress.com/userfiles/file/giwonifupig.pdf
    • http://villa-carlshorst.de/sites/default/files/file/fisuwulapuretilelowix.pdf
    • http://z-sinpro.com/upload/files/losigakokekolo.pdf
    • http://cancunday.com/travela/img/files/77320206880.pdf
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/wadujipukuxego.pdf
    • https://pvesc.vn/uploaded/file/tifopiziwivevaf.pdf
    • http://americasbestmanassas.com/uploads/files/21814668970.pdf
    • http://skrn.cz/pic/file/vilazoza.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=screen+share+metasploit+android
    • 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_off0000c195.bin
dee4431d0bae5cfcae6fe172e1493b578066b9bb82589d765a89b25f4fafe900		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC195 17108 bytes
font_01_sfnt_off0000ee40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 16792 bytes
font_02_sfnt_off00010657.bin
edf872308a9606454be15beecdb6b5c0c7388495965b3f2aff63127d6a305064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 10852 bytes

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