Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f26db0165462aa…

MALICIOUS

PDF

72.3 KB Created: 2021-09-12 14:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a791a674c2c048fa46a0b2726eef5bd SHA-1: 1d99560f85df4c39cc631b0c400a8b8dff1b34e3 SHA-256: 14f26db0165462aaf865401b935a1d8a9d28949feb51d346d42527738aa76aef
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing software, a common initial access vector. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is part of a phishing campaign aiming to deliver a payload or steal credentials.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://koryosushi.com/uploads/files/ropafonulizuxilobozafim.pdf
    • https://ganganagardentist.com/userfiles/file/murozutap.pdf
    • https://northwestconvention.cz/data/files/mofeludebedunifazel.pdf
    • http://x04ydivan.ru/userfiles/file/42044534330.pdf
    • https://idealist.ro/userfiles/file/fatolagujexawos.pdf
    • http://dulichtantai.com/files/uploaded/files/88357786339.pdf
    • https://grupa-energia.pl/attachments/file/62990473835.pdf
    • http://orenprom.com/img/account/file/19247019310.pdf
    • https://falconshipping-uae.com/userfiles/files/68525389354.pdf
    • https://rgcsmt.org/ckfinder/userfiles/files/renewegumuriz.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vhqs0q2bbjgbejmnr0lam8ajk3/73753411535.pdf
    • http://blfimmobiliare.com/userfiles/files/migaka.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16139542e9799d---rugupulogefususuvelixaxaf.pdf
    • http://www.moyekolodin.com/files/futemuvozulodavope.pdf
    • https://szallas-karpatalja.net/upload/nevojejeko.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/paxupusezivap.pdf
    • https://tavio.ru/files/file/babexa.pdf
    • https://cleartunemonitors.com/ckfinder/userfiles/files/vejukiburanadepo.pdf
    • http://litroshaber.net/resimler/files/11385120755.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/xujegewirido.pdf
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/73180442208.pdf
    • http://agilesolutions.in/uploads/9847921761.pdf
    • https://bozoklar.org/ckfinder/userfiles/files/roporabudamunezesurog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+install+tubemate+app
    • 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_off0000ba31.bin
f3712f41866c9d115b476d7c47b2c85113da95346c5503903c3ddbb2b01a0c1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA31 16056 bytes
font_01_sfnt_off0000e346.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 16792 bytes
font_02_sfnt_off0000fb5d.bin
844a882df3980f6b5097495cbc3b49657211d7b352680bc1abcef430a702cb48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 10632 bytes

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